fix: crash when tag's %(creatordata) returns empty string (#1705)

Signed-off-by: leo <[email protected]>

Author: love-linger

src/Commands/QueryTags.cs

@@ -40,14 +40,14 @@ public QueryTags(string repo)
                     IsAnnotated = subs[1].Equals("tag", StringComparison.Ordinal),
                     SHA = string.IsNullOrEmpty(subs[3]) ? subs[2] : subs[3],
                     Creator = Models.User.FindOrAdd(subs[4]),
-                    CreatorDate = ulong.Parse(subs[5]),
+                    CreatorDate = string.IsNullOrEmpty(subs[5]) ? 0 : ulong.Parse(subs[5]),
                     Message = message,
                 });
             }
 
             return tags;
         }
 
-        private string _boundary = string.Empty;
+        private readonly string _boundary;
     }
 }