Fixed if not None statement.

geomagio/processing/copy_instrument.py

@@ -174,7 +174,7 @@ def upload_instrument_metadata(
     )
     prior_metadata = factory.get_metadata(query=prior_metadata)
 
-    if prior_metadata is not None:
+    if len(prior_metadata) != 0:
         if len(prior_metadata) > 1:
             print(
                 "More than one matching metadata objects exist, fix database before continuing"