Drop none-valued query parameters by default

model_server/clients/imagej/adapter.py

@@ -27,7 +27,7 @@ def hit_endpoint(method, endpoint, params=None, body=None, drop_none=True):
     if not method in ['GET', 'PUT']:
         raise Exception('Can only handle GET and PUT requests')
     k_pop = []
-    if drop_none:
+    if drop_none and params is not None:
         for k, v in params.items():
             if v is None:
                 k_pop.append(k)