utils: Improve the EVR equality
utils: Improve the EVR equality

It seems that with a newer version of SQLAlchemy I'm going through this
code when querying the DB for packages, even when not filtering on the
EVR.

And when no package is found by the query, SQLAlchemy uses this value
for the "other": <symbol 'NO_VALUE>

No idea why this is happening, but this additional check can't hurt
anyway.

network-box/uptrack,network-box/uptrack