fix: omit empty variables from pkg-config file generation

JeffersonLab / iguana

Preservation of common physics data analysis algorithms. Currently focused on HIPO data.

https://jeffersonlab.github.io/iguana/

GNU Lesser General Public License v3.0

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Closed c-dilks closed 4 months ago

c-dilks commented 4 months ago

Fixes the following meson error:

ERROR: pkgconfig.generate keyword argument "variables" empty variable value