Bug 1042508 - Guided Editor - when closing as asset always asks "Are you sure you want to discard unsaved data" even if nothing has been changed

(cherry picked from commit 0c56ec399f1acd88903e4f84a02acd9244305df0)

Conflicts:
	kie-wb-common-screens/kie-wb-common-data-modeller/kie-wb-common-data-modeller-client/src/main/java/org/kie/workbench/common/screens/datamodeller/client/DataModelerScreenPresenter.java
	kie-wb-common-screens/kie-wb-common-default-editor/kie-wb-common-default-editor-client/src/main/java/org/kie/workbench/common/screens/defaulteditor/client/editor/GuvnorDefaultEditorViewImpl.java
	kie-wb-common-screens/kie-wb-common-java-editor/kie-wb-common-java-editor-client/src/main/java/org/kie/workbench/common/screens/javaeditor/client/editor/JavaSourceViewImpl.java
	kie-wb-common-screens/kie-wb-common-java-editor/kie-wb-common-java-editor-client/src/main/java/org/kie/workbench/common/screens/javaeditor/client/widget/EditJavaSourceWidget.java
	kie-wb-common-widgets/kie-wb-common-ui/src/main/java/org/kie/workbench/common/widgets/client/widget/DatePicker.java
	kie-wb-common-widgets/kie-wb-metadata-widget/src/main/java/org/kie/workbench/common/widgets/metadata/client/KieEditor.java
	kie-wb-common-widgets/kie-wb-metadata-widget/src/main/java/org/kie/workbench/common/widgets/metadata/client/KieEditorView.java
	kie-wb-common-widgets/kie-wb-metadata-widget/src/main/java/org/kie/workbench/common/widgets/metadata/client/widget/CategorySelectorWidget.java
	kie-wb-common-widgets/kie-wb-metadata-widget/src/main/java/org/kie/workbench/common/widgets/metadata/client/widget/MetadataWidget.java