Reverse logic for missing uid #45
Description
Hello, we have notice that SDK 1.8.0 generate a lot of error for Entry Uid is required, after debugging it we found out that the logic for empty uid is wrong here - https://github.com/contentstack/contentstack-java/blob/master/src/main/java/com/contentstack/sdk/Entry.java#L955 , its check if its not empty, then throw an error. Can we release minor version with the fix please, we need 1.8.0, because of log4j update, but our logs are full of that error.