Merge pull request #1197 from foosel/fix/issue_1147

Fixes commands not being acknowledged in the same order they are received in

Marlin/Marlin_main.cpp

           case 1:
           case 2:
           case 3:
-            if(Stopped == false) { // If printer is stopped by an error the G[0-3] codes are ignored.
-          #ifdef SDSUPPORT
-              if(card.saving)
-                break;
-          #endif //SDSUPPORT
-              SERIAL_PROTOCOLLNPGM(MSG_OK);
-            }
-            else {
+            if (Stopped == true) {
               SERIAL_ERRORLNPGM(MSG_ERR_STOPPED);
               LCD_MESSAGEPGM(MSG_STOPPED);
             }
           #endif //FWRETRACT
         prepare_move();
         //ClearToSend();
-        return;
       }
       break;
 #ifndef SCARA //disable arc support
       if(Stopped == false) {
         get_arc_coordinates();
         prepare_arc_move(true);
-        return;
       }
       break;
     case 3: // G3  - CCW ARC
       if(Stopped == false) {
         get_arc_coordinates();
         prepare_arc_move(false);
-        return;
       }
       break;
 #endif