configure exits with error if cppunit isn't found

[gida]

[...]
checking for snappy_compress in -lsnappy... yes
checking for cppunit >= 1.13.0... no
configure: WARNING: Unit Tests disabled - missing cppunit
checking for openssl >= 1.0.2... yes
checking whether C++ compiler accepts -Wall -Wextra -Wpedantic ... yes
checking that generated files are newer than configure... done
configure: error: conditional "HAVE_CPPUNIT" was never defined.
Usually this means the macro was only invoked conditionally.

Shouldn't it just continue when it disabled Unit Tests previously?