Virtual Backups: skip jobs with no files (fix)

When looking for jobids to consolidate, we now skip jobs
that have no data.

This fixes the problem that consolidations fail
when no files were changed.

Fixes #793: Always incremental consolidate fails when no files are changed

src/cats/sql_get.c

@@ -1302,7 +1302,7 @@ bool B_DB::accurate_get_jobids(JCR *jcr, JOB_DBR *jr, db_list_ctx *jobids)
  "SELECT JobId, StartTime, EndTime, JobTDate, PurgedFiles "
    "FROM Job JOIN FileSet USING (FileSetId) "
   "WHERE ClientId = %s "
-  "AND JobBytes > 0"
+    "AND JobFiles > 0 "
     "AND Level='D' AND JobStatus IN ('T','W') AND Type='B' "
     "AND StartTime > (SELECT EndTime FROM btemp3%s ORDER BY EndTime DESC LIMIT 1) "
     "AND StartTime < '%s' "
@@ -1330,7 +1330,7 @@ bool B_DB::accurate_get_jobids(JCR *jcr, JOB_DBR *jr, db_list_ctx *jobids)
  "SELECT JobId, StartTime, EndTime, JobTDate, PurgedFiles "
    "FROM Job JOIN FileSet USING (FileSetId) "
   "WHERE ClientId = %s "
-  "AND JobBytes > 0"
+    "AND JobFiles > 0 "
     "AND Level='I' AND JobStatus IN ('T','W') AND Type='B' "
     "AND StartTime > (SELECT EndTime FROM btemp3%s ORDER BY EndTime DESC LIMIT 1) "
     "AND StartTime < '%s' "