mysql dump: return error on dumps without data

plugins/localdump/mysql.sh

@@ -95,12 +95,13 @@ function mysql.db.dump(){
 
   zgrep -iE "(CREATE|INSERT)" "$_dumpfile" >/dev/null
   typeset -i local _rc2=$?
-  test $_rc2 -ne 0 && echo "ERROR: the dump does not contain an insert statement."
+  test $_rc2 -ne 0 && echo "ERROR: the dump does not contain any CREATE or INSERT statement."
 
-  typeset -i local _rctotal=$?+$_rc2
-  test $_rctotal -eq 0 && mysql_COUNT_DUMPS+=1
-  test $_rctotal -eq 0 || mysql_COUNT_ERRORS+=1
-  test $_rctotal -eq 0
+  typeset -i local myrc+=$_rc2
+  test $myrc -eq 0 && mysql_COUNT_DUMPS+=1
+  test $myrc -eq 0 || mysql_COUNT_ERRORS+=1
+
+  test $myrc -eq 0  
 }
 
 # import [file] --> [database]