Problem with postprocessing and nonlocal fnctional rVV10 wasn't yet solved
by yesterday's commit


git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@11035 c92efa57-630b-4861-b058-cf58834340f0
Testing a variable (vdw_table_name) that may have never been initialized 
doesn't seem to me such a good idea


git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@11036 c92efa57-630b-4861-b058-cf58834340f0