Errormessage for wrong index at call of delMap

src/colorPlot.cpp

@@ -417,11 +417,23 @@ int RectPlotItem::addMap()
 void RectPlotItem::delMap(int index)
 {
     if(mMaps.size() == 1){
+        if(index != 0)
+        {
+            debout << "Invalid index for map deletion!" << std::endl;
+            return;
+        }
         mMaps.replace(0, RectMap());
         return;
     }
+
     if (index >= 0 && index < mMaps.size() && mMaps.size() > 0)
+    {
         mMaps.removeAt(index);
+        return;
+    }
+
+    debout << "Invalid index for map deletion!" << std::endl;
+    return;
 }
 
 void RectPlotItem::changeMap(int index, double x, double y, double w, double h, bool colored, double mapHeight)