Update MonitorConfigOverrideDialog.qml

Contributes to CL-1259

plugins/UM3NetworkPrinting/resources/qml/MonitorConfigOverrideDialog.qml

@@ -30,6 +30,26 @@ UM.Dialog
                 OutputDevice.forceSendJob(printer.activePrintJob.key)
                 overrideConfirmationDialog.close()
             }
+            visible:
+            {
+                // Don't show the button if we're missing a printer or print job
+                if (!printer || !printer.activePrintJob)
+                {
+                    return false
+                }
+
+                // Check each required change...
+                for (var i = 0; i < printer.activePrintJob.configurationChanges.length; i++)
+                {
+                    var change = printer.activePrintJob.configurationChanges[i]
+                    // If that type of change is in the list of blocking changes, hide the button
+                    if (!change.canOverride)
+                    {
+                        return false
+                    }
+                }
+                return true
+            }
         },
         Button
         {