v10.3.0.2で作成したロボットの先頭に「Assign Variable（変数の割当）」ステップがあると、v10.3.xでエラーが発生する

現象

バージョン10.3.0.2で作成したロボットの先頭に「Assign Variable（変数の割当）」ステップがあると、10.3.0.2以降のロボット読み込み時にInternal Errorとなり開けない。
※10.4では修正済み

対処方法

下位バージョンの10.3.0.2で以下の対応を実施ください。
・任意のステップ名に変更する。
※デフォルトのステップ名の場合に本事象が発生するので、任意のステップ名を変更することで回避することができます。

・例）Stack Trace（スタックトレース）のエラーメッセージ

java.lang.NullPointerException
	at kapow.robot.robomaker.model.common.engine.RobotExecutionModel.getDataState(RobotExecutionModel.java:209)
	at kapow.robot.plugin.common.support.datamapping.ShowXMLDataMappingDialogAction.getUpdatedEnabledState(ShowXMLDataMappingDialogAction.java:62)
	at kapow.robot.robomaker.gui.common.action.EditedStepBasedAction.updateEnabledState(EditedStepBasedAction.java:139)
	at kapow.robot.robomaker.gui.common.action.EditedStepBasedAction.lambda$new$330(EditedStepBasedAction.java:95)
	at kapow.util.model.ChangeAggregatingModel.endModifications(ChangeAggregatingModel.java:92)
	at kapow.robot.robomaker.engine.design.direct.DirectExecutionController.applyEngineStateToExecutionModel(DirectExecutionController.java:261)
	at kapow.robot.robomaker.engine.ExecutionController.updateToEngineStateChanges(ExecutionController.java:149)
	at kapow.robot.robomaker.engine.design.DesignExecutionController.access$1800(DesignExecutionController.java:31)
	at kapow.robot.robomaker.engine.design.DesignExecutionController$DesignModeExecutionControllerEngineCallback$2.doUpdate(DesignExecutionController.java:458)
	at kapow.util.gui.SwingUpdateHandler.doPendingUpdates(SwingUpdateHandler.java:249)
	at kapow.util.gui.SwingUpdateHandler.waitForEndOfUpdates(SwingUpdateHandler.java:121)
	at kapow.robot.robomaker.engine.design.DesignExecutionController$DesignModeExecutionControllerEngineCallback.executionInitiated(DesignExecutionController.java:394)
	at kapow.robot.robomaker.engine.StudioRobotExecutionEngine.startBackgroundExecution(StudioRobotExecutionEngine.java:312)
	at kapow.robot.robomaker.engine.design.direct.DirectRobotExecutionEngine.startExecution(DirectRobotExecutionEngine.java:482)
	at kapow.robot.robomaker.engine.design.DesignRobotExecutionEngine.setAutomaticExecutionEnabled(DesignRobotExecutionEngine.java:152)
	at kapow.robot.robomaker.engine.design.DesignExecutionController.enableAutomaticExecutionWithoutUndo(DesignExecutionController.java:269)
	at kapow.robot.robomaker.RoboMaker.enableAutomaticExecutionWithoutUndo(RoboMaker.java:970)
	at com.kapowtech.connector.platform.studio.editor.robot.RobotEditor.makeRobotReadyForEditing(RobotEditor.java:396)
	at com.kapowtech.connector.platform.studio.editor.robot.RobotEditor.<init>(RobotEditor.java:331)
	at com.kapowtech.connector.platform.common.robot.AbstractRobotFileType.createFileEditor(AbstractRobotFileType.java:133)
	at com.kapowtech.connector.platform.studio.ide.controller.IDEController.getFileEditor(IDEController.java:763)
	at com.kapowtech.connector.platform.studio.ide.controller.IDEController.getFileEditor(IDEController.java:732)
	at com.kapowtech.connector.platform.studio.ide.controller.IDEController.createAndSelectFileEditor(IDEController.java:1296)
	at com.kapowtech.connector.platform.studio.ide.controller.IDEController.lambda$null$897(IDEController.java:1245)
	at kapow.util.gui.SwingThreadUtil$1.run(SwingThreadUtil.java:56)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
	at TRIGGERED_BY.invokeLater(Unknown Source)
	at kapow.util.gui.SwingThreadUtil.invokeLater(SwingThreadUtil.java:50)
	at com.kapowtech.connector.platform.studio.ide.controller.IDEController.lambda$openFileElement$899(IDEController.java:1237)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)