fixed gui exception when selecting a render texture as input

Author: jasonm-unity

source/FrameRecorder/Core/Editor/RecorderWindow.cs

@@ -109,19 +109,22 @@ public void OnGUI()
                 {
                     EditorGUILayout.EndScrollView();
                 }
+            }
+            catch (ExitGUIException)
+            {
+                
             }
             catch (Exception ex)
             {
                 if (m_State == EState.Recording)
+                {
                     try
                     {
                         Debug.LogError("Aborting recording due to an exception!\n" + ex.ToString());
                         StopRecording();
                     }
-                    catch (Exception)
-                    {
-
-                    }
+                    catch (Exception) {}
+                }
                 Debug.LogException(ex);
             }
         }