fix warning

bibtexbrowser.php

@@ -405,6 +405,7 @@ function _zetDB($bibtex_filenames) {
     }
   }
 
+  if (config_value('BIBTEXBROWSER_USE_CACHE')==true) {
     // now we may update the database
     if (!file_exists($compiledbib)) {
       @touch($compiledbib);
@@ -413,19 +414,19 @@ function _zetDB($bibtex_filenames) {
         // is it up to date ? wrt to the bib file and the script
       // then upgrading with a new version of bibtexbrowser triggers a new compilation of the bib file
       if (filemtime($bib)>filemtime($compiledbib) || filemtime(__FILE__)>filemtime($compiledbib)) {
-//       echo "updating  ".$bib;
+  //       echo "updating  ".$bib;
         $db->update($bib);
         $updated = true;
       }
     }
-
+  }
 //   echo var_export($parse);
 //   echo var_export($updated);
 
   $saved = false;
   // are we able to save the compiled version ?
   // note that the compiled version is saved in the current working directory
-  if ( ($parse || $updated ) && is_writable($compiledbib)) {
+  if ( config_value('BIBTEXBROWSER_USE_CACHE')==true && ( $parse || $updated ) && is_writable($compiledbib)) {
     // we use 'a' because the file is not locked between fopen and flock
     $f = fopen($compiledbib,'a');
     //we use a lock to avoid that a call to bibbtexbrowser made while we write the object loads an incorrect object