Patch by tom@platte.com (Tom Schutter) -- wasn't working if no groups

had isbuggroup set.

webtools/bugzilla/sanitycheck.cgi

@@ -87,6 +87,9 @@ while (my $bit = FetchOneColumn()) {
     
 SendSQL("select sum(bit) from groups where isbuggroup != 0");
 my $buggroupset = FetchOneColumn();
+if ($buggroupset eq "") {
+    $buggroupset = 0;
+}
 SendSQL("select bug_id, groupset from bugs where groupset & $buggroupset != groupset");
 while (@row = FetchSQLData()) {
     Alert("Bad groupset $row[1] found in bug " . BugLink($row[0]));