Description of the problem / feature request:

When overriding the copts and linkopts build configuration with None values in a transition, Bazel crashes with a NullPointerException.

Bugs: what's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

def _my_transition_impl(settings, attr):
    return {
        "//command_line_

I've noticed that some files have conflicting license statements. For instance the header of file scripts/ZoneMinder/lib/ZoneMinder/Trigger/Channel.pm claims GPL-2+ but in the end of the same file I found the following statement:

This library is free

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Environment

• VerneMQ

This is to help people that for whatever reason don't want to go through the effort of changing it manually every time.

Default levels of understanding and thoroughness for both positive (review)and negative(flag) could also be configurable in the user-config file.