[mod] #240/#223: Use ModuleNotFoundError when click is not installed

Requires Python 3.6
https://docs.python.org/3/library/exceptions.html#ModuleNotFoundError

silkaj/network_tools.py

@@ -134,9 +134,7 @@ class EndPoint(object):
             ctx = get_current_context()
             peer = ctx.obj["PEER"]
             gtest = ctx.obj["GTEST"]
-        # To be activated when dropping Python 3.5
-        # except (ModuleNotFoundError, RuntimeError):
-        except:
+        except (ModuleNotFoundError, RuntimeError):
             peer, gtest = None, None
         if peer:
             if ":" in peer: