Implemented safer minus sign trimming in check_mpireports and match_mpireports...

Implemented safer minus sign trimming in check_mpireports and match_mpireports to correctly deal with size 0 messages.

tools/check_mpireports.py

@@ -105,7 +105,7 @@ for f in infiles:
                     + "/"
                     + words[tagcol]
                     + "/"
-                    + words[sizecol][1:]
+                    + words[sizecol].replace("-", "")
                 )
                 if words[typecol] == "send":
                     esends[key] = [line[:-1]]

tools/match_mpireports.py

@@ -102,7 +102,7 @@ for f in infiles:
                     + "/"
                     + words[tagcol]
                     + "/"
-                    + words[sizecol][1:]
+                    + words[sizecol].replace("-", "")
                 )
 
                 if not key in recvs: