Fixed error with asynchronous handling of VM remove and VM halting

It will hopefully fix QubesOS/qubes-issues#4163 .

references QubesOS/qubes-issues#4163

qubesmanager/qube_manager.py

@@ -153,6 +153,10 @@ class VmRowInTable:
                 self.size_widget.update()
         except exc.QubesPropertyAccessError:
             pass
+        except exc.QubesDaemonNoResponseError:
+            # TODO: this will be fixed by a rewrite moving the event system to
+            # AdminAPI
+            pass
 
         #force re-sorting
         self.table.setSortingEnabled(True)

test-packages/qubesadmin/exc.py

@@ -10,3 +10,6 @@ class QubesVMNotStartedError(BaseException):
 
 class QubesPropertyAccessError(BaseException):
     pass
+
+class QubesDaemonNoResponseError(BaseException):
+    pass