[escher/pointer_text_view] Clean minimalSizeForOptimalDisplay

It was unneedingly overriden + added escape case on nullptr text

escher/include/escher/pointer_text_view.h

@@ -10,7 +10,6 @@ public:
     KDColor textColor = KDColorBlack, KDColor backgroundColor = KDColorWhite);
   const char * text() const override { return m_text; }
   void setText(const char * text) override;
-  KDSize minimalSizeForOptimalDisplay() const override;
 private:
   const char * m_text;
 };

escher/src/pointer_text_view.cpp

@@ -14,7 +14,3 @@ void PointerTextView::setText(const char * text) {
     markRectAsDirty(bounds());
   }
 }
-
-KDSize PointerTextView::minimalSizeForOptimalDisplay() const  {
-  return m_font->stringSize(text());
-}

escher/src/text_view.cpp

@@ -33,6 +33,9 @@ void TextView::setFont(const KDFont * font) {
 }
 
 KDSize TextView::minimalSizeForOptimalDisplay() const  {
+  if (text() == nullptr) {
+    return KDSize(0,0);
+  }
   return m_font->stringSize(text());
 }