Check if game results have been changed.

mktable

@@ -9,6 +9,10 @@ git checkout master
 ./tour-parse > $results
 git add $results
 git commit -m "Update game results."
+# Successful `git commit' returns exit code `0'
+ret_code=$?
+
+if [[ $ret_code == 0 ]]; then
 
     # Update the tournament table
     bin/lorchess > temp_table.html
@@ -20,3 +24,4 @@ git checkout master
 
     # Check the difference between game results
     git diff HEAD^ HEAD -- $results
+fi