[js/index.php] Check for readability before opening the git HEAD log -- Fixes #5288 -- Thanks Krinkle
[js/index.php] Check for readability before opening the git HEAD log -- Fixes #5288 -- Thanks Krinkle

hinaloe/jqm-demo-ja,arschmitz/uglymongrel-jquery-mobile,startxfr/jquery-mobile,startxfr/jquery-mobile,arschmitz/uglymongrel-jquery-mobile,hinaloe/jqm-demo-ja,arschmitz/uglymongrel-jquery-mobile,arschmitz/jquery-mobile,hinaloe/jqm-demo-ja,startxfr/jquery-mobile,arschmitz/jquery-mobile,arschmitz/jquery-mobile