Should be explicit that when there are syntax errors the code is not executed

[tlatoza]

Users new to seeCode.run may not realize that the red markers in the gutter are syntax errors. In this case, they may be thinking that they edited the code and the code was executed, when in fact the code was not executed because there was a syntax error.

To make it clear that the code was not executed due to one or more syntax errors, the console output should state this explicitly.