repograph: fixed. (was crashing on broken hdlists)

urpm-repodiff.py

@@ -356,6 +356,8 @@ def ParseSynthesis(synthfile, pkgdict, arg):
         synth = open(synthfile)
         tmp = ['', '', '']
         for synthline in synth:
+    	    if not synthline.startswith('@'):
+    		continue
             if synthline.endswith('\n'):
                 synthline = synthline[:-1]
             tmpline = synthline.split('@')