patch for div by zero error

diff --git a/lib/CloudForecast/Data/Mysqlcachehit.pm b/lib/CloudForecast/Data/Mysqlcachehit.pm
index 4ef3ae6..238dca8 100644
--- a/lib/CloudForecast/Data/Mysqlcachehit.pm
+++ b/lib/CloudForecast/Data/Mysqlcachehit.pm
@@ -93,13 +93,13 @@ fetcher {
         (1.0 - $status{'key_reads'} / $status{'key_read_requests'} ) * 100;

     my $query_cache          = sprintf '%.2f',
-        ($status{'qcache_hits'} / ($status{'qcache_inserts'} + $status{'qcache_hits'} + $status{'qcache_not_cached'})
+        ($status{'qcache_hits'} / ( ($status{'qcache_inserts'} + $status{'qcache_hits'} + $status{'qcache_not_cached'

     my $table_lock_immediate = sprintf '%.2f',
-        ($status{'table_locks_immediate'} / ($status{'table_locks_immediate'} + $status{'table_locks_waited'}) ) * 10
+        ($status{'table_locks_immediate'} / ( ($status{'table_locks_immediate'} + $status{'table_locks_waited'}) || 1

     my $thread_cache         = sprintf '%.2f',
-        (1.0 - $status{'threads_created'} / $status{'connections'} ) * 100;
+        (1.0 - $status{'threads_created'} / ( $status{'connections'} || 1 ) ) * 100;

     my $tmp_table_on_memory  = sprintf '%.2f',
         ($status{'created_tmp_tables'} / (($status{'created_tmp_tables'} + $status{'created_tmp_disk_tables'}) || 1)