While adding audience condition in code mode, add error message if syntax is wrong

In Web and Full Stack, if you add an audience condition via the code mode, and you do not add the "and" at the beginning, the audience cannot be saved, but no error message is generated, so it is not clear what is happening. Please add an error message explaining the issue. For example, in the console it says "expecting and|or". Even just mentioning this in a error message would help troubleshooting.