Don't append NULL when a variable doesn't exist
This caused a glib warning when the following was encountered in
xml2po.pc
(and PYTHON_PREFIX
wasn't defined):
modesdir=${PYTHON_PREFIX}/lib/python2.7/site-packages/xml2po
This caused a glib warning when the following was encountered in
xml2po.pc
(and PYTHON_PREFIX
wasn't defined):
modesdir=${PYTHON_PREFIX}/lib/python2.7/site-packages/xml2po