Spinners with RawOutput enabled print lots of blank characters to logs, because the spinners are always calling sClearLine. Additionally, spinners without any text print several blank newlines to logs.

e.g.

^M                                                                                ^MDoing something
^M                                                                                ^MSUCCESS: Doing something

This PR suppresses line clearing when RawOutput is true, and only writes to the output if there's any text to write.