File permissions change, check for non-zero tags.csv for issue #9

The tags index.php file now checks for the tags.csv to be non-zero as
well as existing.
Updated the permission of the generated tags.csv file to allow the CMS
to updated it with out requiring root/sudo permissions.

blog/by_tag/index.php

@@ -5,6 +5,10 @@
   echo "<article><h1 id=\"page_title\">Posts by Tag</h1></article>";
   echo "<div id=\"search_inputs\"><input type=\"text\" id=\"tag_sort\" onkeyup=\"tag_search()\" placeholder=\"Search Tags...\" title=\"Type a tage to search\"><input id=\"search_toggle\" type=\"button\" value=\"Search Titles\" onclick=\"search_toggle()\"></div><!--End Div Search Inputs-->";
   function read_tags($tags_file){
+    if (filesize($tags_vile) == 0){
+      echo "<br/>\n<br/>";
+      return;
+    }
     $tags_csv = array_map('str_getcsv', file('tags.csv'));
     $tags_rows = sizeof($tags_csv);
     $tags_coloums = sizeof($tags_csv[0]);
@@ -49,6 +53,8 @@
     $empty_csv = fopen("tags.csv", "w") or die("Cannot write new tags.csv file.");
     fwrite($empty_csv, "");
     fclose($empty_csv);
+    chmod('./tags.csv', 0666);
+    read_tags('tags.csv');
   }
   include_once ($_SERVER['DOCUMENT_ROOT'].'/common/php/footer.php');
 ?>