Fixed camera for legacy UM3 printer again

CL-541

cura/PrinterOutput/NetworkCamera.py

@@ -59,7 +59,6 @@ class NetworkCamera(QObject):
 
     @pyqtSlot()
     def stop(self):
-
         self._stream_buffer = b""
         self._stream_buffer_start_index = -1
 

cura/PrinterOutputDevice.py

@@ -97,7 +97,6 @@ class PrinterOutputDevice(QObject, OutputDevice):
         # create the item (and fail) every time.
         if not self._monitor_component:
             self._createMonitorViewFromQML()
-
         return self._monitor_item
 
     @pyqtProperty(QObject, constant=True)

plugins/UM3NetworkPrinting/LegacyUM3OutputDevice.py

@@ -74,7 +74,6 @@ class LegacyUM3OutputDevice(NetworkedPrinterOutputDevice):
 
         self._monitor_view_qml_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), "MonitorItem.qml")
 
-
         self._output_controller = LegacyUM3PrinterOutputController(self)
 
     def _onAuthenticationStateChanged(self):

plugins/UM3NetworkPrinting/MonitorItem.qml

@@ -6,6 +6,10 @@ import Cura 1.0 as Cura
 
 Component
 {
+    Item
+    {
+        width: maximumWidth
+        height: maximumHeight
         Image
         {
             id: cameraImage
@@ -14,6 +18,13 @@ Component
             anchors.horizontalCenter: parent.horizontalCenter
             anchors.verticalCenter: parent.verticalCenter
             z: 1
+            Component.onCompleted:
+            {
+                if(OutputDevice.activePrinter != null && OutputDevice.activePrinter.camera != null)
+                {
+                    OutputDevice.activePrinter.camera.start()
+                }
+            }
             onVisibleChanged:
             {
                 if(visible)
@@ -40,3 +51,4 @@ Component
             }
         }
     }
+}