QmlDesigner: Fix a couple of undefined warnings

Change-Id: I6bf62904a3fc4b45252f3859d6996c28b459d949
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

share/qtcreator/qmldesigner/propertyEditorQmlSources/imports/HelperWidgets/AlignmentHorizontalButtons.qml

@@ -58,9 +58,19 @@ Row {
         evaluate()
     }
 
-    property bool isInModel: backendValue.isInModel
+    property bool isInModel: {
+        if (backendValue !== undefined && backendValue.isInModel !== undefined)
+            return backendValue.isInModel
+
+        return false
+    }
     onIsInModelChanged: evaluate()
-    property bool isInSubState: backendValue.isInSubState
+    property bool isInSubState: {
+        if (backendValue !== undefined && backendValue.isInSubState !== undefined)
+            return backendValue.isInSubState
+
+        return false
+    }
     onIsInSubStateChanged: evaluate()
 
     function evaluate() {

share/qtcreator/qmldesigner/propertyEditorQmlSources/imports/HelperWidgets/AlignmentVerticalButtons.qml

@@ -55,9 +55,19 @@ Row {
         evaluate()
     }
 
-    property bool isInModel: backendValue.isInModel
+    property bool isInModel: {
+        if (backendValue !== undefined && backendValue.isInModel !== undefined)
+            return backendValue.isInModel
+
+        return false
+    }
     onIsInModelChanged: evaluate()
-    property bool isInSubState: backendValue.isInSubState
+    property bool isInSubState: {
+        if (backendValue !== undefined && backendValue.isInSubState !== undefined)
+            return backendValue.isInSubState
+
+        return false
+    }
     onIsInSubStateChanged: evaluate()
 
     function evaluate() {

share/qtcreator/qmldesigner/propertyEditorQmlSources/imports/HelperWidgets/ColorEditor.qml

@@ -39,6 +39,9 @@ SecondColumnLayout {
     property bool supportGradient: false
     property variant backendValue
     property variant value: {
+        if (colorEditor.backendValue === undefined || colorEditor.backendValue.value === undefined)
+            return "white" // default color for Rectangle
+
         if (colorEditor.isVector3D)
             return Qt.rgba(colorEditor.backendValue.value.x,
                            colorEditor.backendValue.value.y,

share/qtcreator/qmldesigner/propertyEditorQmlSources/imports/HelperWidgets/ColorLogic.qml

@@ -33,8 +33,18 @@ QtObject {
     property color textColor: StudioTheme.Values.themeTextColor
     property variant valueFromBackend: backendValue === undefined ? 0 : backendValue.value
     property bool baseStateFlag: isBaseState
-    property bool isInModel: backendValue === undefined ? false : backendValue.isInModel
-    property bool isInSubState: backendValue === undefined ? false : backendValue.isInSubState
+    property bool isInModel: {
+        if (backendValue !== undefined && backendValue.isInModel !== undefined)
+            return backendValue.isInModel
+
+        return false
+    }
+    property bool isInSubState: {
+        if (backendValue !== undefined && backendValue.isInSubState !== undefined)
+            return backendValue.isInSubState
+
+        return false
+    }
     property bool highlight: textColor === __changedTextColor
     property bool errorState: false
 

share/qtcreator/qmldesigner/propertyEditorQmlSources/imports/HelperWidgets/ExtendedFunctionLogic.qml

@@ -33,8 +33,18 @@ Item {
     id: extendedFunctionButton
 
     property variant backendValue
-    property bool isBoundBackend: backendValue === undefined ? false : backendValue.isBound
-    property string backendExpression: backendValue === undefined ? "" : backendValue.expression
+    property bool isBoundBackend: {
+        if (backendValue !== undefined && backendValue.isBound !== undefined)
+            return backendValue.isBound
+
+        return false
+    }
+    property string backendExpression: {
+        if (backendValue !== undefined && backendValue.expression !== undefined)
+            return backendValue.expression
+
+        return ""
+    }
 
     property string glyph: StudioTheme.Constants.actionIcon
     property string color: StudioTheme.Values.themeTextColor