Editor: Add Check for TextMark color definition.

Change-Id: I805402a5ec9595bd31b6d72c5934198c77a1f402
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/texteditor/textmark.cpp

@@ -122,6 +122,11 @@ Theme::Color TextMark::categoryColor(Id category)
     return TextEditorPlugin::baseTextMarkRegistry()->categoryColor(category);
 }
 
+bool TextMark::categoryHasColor(Id category)
+{
+    return TextEditorPlugin::baseTextMarkRegistry()->categoryHasColor(category);
+}
+
 void TextMark::setCategoryColor(Id category, Theme::Color color)
 {
     TextEditorPlugin::baseTextMarkRegistry()->setCategoryColor(category, color);
@@ -230,6 +235,11 @@ Theme::Color TextMarkRegistry::categoryColor(Id category)
     return m_colors.value(category, Theme::ProjectExplorer_TaskWarn_TextMarkColor);
 }
 
+bool TextMarkRegistry::categoryHasColor(Id category)
+{
+    return m_colors.contains(category);
+}
+
 void TextMarkRegistry::setCategoryColor(Id category, Theme::Color color)
 {
     if (m_colors[category] == color)

src/plugins/texteditor/textmark.h

@@ -81,6 +81,7 @@ public:
     virtual void dragToLine(int lineNumber);
 
     static Utils::Theme::Color categoryColor(Core::Id category);
+    static bool categoryHasColor(Core::Id category);
     static void setCategoryColor(Core::Id category, Utils::Theme::Color color);
     void setIcon(const QIcon &icon);
     // call this if the icon has changed.

src/plugins/texteditor/textmarkregistry.h

@@ -59,6 +59,7 @@ public:
     void add(TextMark *mark);
     bool remove(TextMark *mark);
     Utils::Theme::Color categoryColor(Core::Id category);
+    bool categoryHasColor(Core::Id category);
     void setCategoryColor(Core::Id category, Utils::Theme::Color color);
 private slots:
     void editorOpened(Core::IEditor *editor);