Filter empty parameters for GET requests

Adding empty string as a query parameter raises an error in appwrite 1.3
Relevant for optional parameters such as search query in storage.ListFiles.
Filtering allows passing empty string as search query

Author: Suven-p

templates/go/client.go.twig

@@ -262,7 +262,9 @@ func (clt *Client) Call(method string, path string, headers map[string]interface
 						q.Add(fmt.Sprintf("%s[]", key), toString(arr.Index(i)))
 					}
 				default:
-					q.Add(key, toString(val))
+					if strVal := toString(val); strVal != "" {
+						q.Add(key, strVal)
+					}
 				}
 			}
 			rawQuery := q.Encode()