'blacklisting' means that there is a criminal case against you...and you are either convicted with jail term and / or penalty by any of the gcc countries. In your case there is no question of blacklisting for the reasons you have mentioned. you have not entered Qatar and so the visa was cancelled. you can happily come to Qatar whenever you want to. But once you enter restrictions will apply whether yo can go back or reenter etc. There is no reason to worry about your future job prospects either here in Qatar or in the GCC.
'blacklisting' means that there is a criminal case against you...and you are either convicted with jail term and / or penalty by any of the gcc countries. In your case there is no question of blacklisting for the reasons you have mentioned. you have not entered Qatar and so the visa was cancelled. you can happily come to Qatar whenever you want to. But once you enter restrictions will apply whether yo can go back or reenter etc. There is no reason to worry about your future job prospects either here in Qatar or in the GCC.
So chill out!!