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

Especially in the light of #151 , it would be great if people could just re-generate the whole Id file.