Fix some issues detected by coverity for the editor.

apps/opencs/model/prefs/modifiersetting.cpp

@@ -15,6 +15,7 @@ namespace CSMPrefs
     ModifierSetting::ModifierSetting(Category* parent, Settings::Manager* values, QMutex* mutex, const std::string& key,
         const std::string& label)
         : Setting(parent, values, mutex, key, label)
+        , mButton(0)
         , mEditorActive(false)
     {
     }

apps/opencs/model/prefs/shortcutsetting.cpp

@@ -17,6 +17,7 @@ namespace CSMPrefs
     ShortcutSetting::ShortcutSetting(Category* parent, Settings::Manager* values, QMutex* mutex, const std::string& key,
         const std::string& label)
         : Setting(parent, values, mutex, key, label)
+        , mButton(0)
         , mEditorActive(false)
         , mEditorPos(0)
     {

apps/opencs/view/render/instancemode.cpp

@@ -74,7 +74,9 @@ osg::Vec3f CSVRender::InstanceMode::getSelectionCenter(const std::vector<osg::re
             ++objectCount;
         }
     }
-    center /= objectCount;
+
+    if (objectCount > 0)
+        center /= objectCount;
 
     return center;
 }
@@ -92,7 +94,7 @@ osg::Vec3f CSVRender::InstanceMode::getScreenCoords(const osg::Vec3f& pos)
 CSVRender::InstanceMode::InstanceMode (WorldspaceWidget *worldspaceWidget, QWidget *parent)
 : EditMode (worldspaceWidget, QIcon (":placeholder"), Mask_Reference, "Instance editing",
   parent), mSubMode (0), mSubModeId ("move"), mSelectionMode (0), mDragMode (DragMode_None),
-  mDragAxis (-1), mLocked (false)
+  mDragAxis (-1), mLocked (false), mUnitScaleDist(1)
 {
 }