Fixes issue decode_responses is set to True regardless if REDIS_OM_UR… (#373)

Fixes issue decode_responses is set to True regardless if REDIS_OM_URL environment variable is set.
Otherwise these warnings pop up when persisting objects:

Could not parse Redis response. Error was: "keywords must be strings". Probably, the connection is not set to decode responses from bytes. Attempting to decode response
using the encoding set on model class (<class 'redis_om.model.model.ModelMeta'>. Encoding: utf-8.

Co-authored-by: dvora-h <67596500+dvora-h@users.noreply.github.com>

aredis_om/connections.py

@@ -7,13 +7,14 @@ URL = os.environ.get("REDIS_OM_URL", None)
 
 
 def get_redis_connection(**kwargs) -> redis.Redis:
+    # Decode from UTF-8 by default
+    if "decode_responses" not in kwargs:
+        kwargs["decode_responses"] = True
+
     # If someone passed in a 'url' parameter, or specified a REDIS_OM_URL
     # environment variable, we'll create the Redis client from the URL.
     url = kwargs.pop("url", URL)
     if url:
         return redis.Redis.from_url(url, **kwargs)
 
-    # Decode from UTF-8 by default
-    if "decode_responses" not in kwargs:
-        kwargs["decode_responses"] = True
     return redis.Redis(**kwargs)