Optimized parsing output when creating only report.
Optimized parsing output when creating only report.

Update issue 1261
Optimized the code that omits keywords a little. Memory usage dropped ~5% and execution got a tiny bit faster. As a bonus the code is also a little cleaner.

fiuba08/robotframework,waldenner/robotframework,fiuba08/robotframework,ldtri0209/robotframework,ldtri0209/robotframework,ldtri0209/robotframework,waldenner/robotframework,ldtri0209/robotframework,waldenner/robotframework,fiuba08/robotframework,waldenner/robotframework,fiuba08/robotframework,fiuba08/robotframework,ldtri0209/robotframework,waldenner/robotframework