Fix --help for core-variables

desktop/variables/desktop.py

@@ -88,6 +88,8 @@ class VariableClDesktopGstData(ReadonlyVariable):
     def get(self):
         # try import gst
         try:
+            copyargv = sys.argv
+            sys.argv = []
             olderr = os.dup(sys.stderr.fileno())
             os.close(sys.stderr.fileno())
             import gst
@@ -95,6 +97,7 @@ class VariableClDesktopGstData(ReadonlyVariable):
         except ImportError:
             gst = None
         finally:
+            sys.argv= copyargv
             os.dup2(olderr,sys.stderr.fileno())
         if gst is None:
             return {}