Handle ownCloud logging when data dir not created

lib/base.php

@@ -304,12 +304,8 @@ class OC {
 			self::$session = new \OC\Session\Internal(OC_Util::getInstanceId());
 			// if session cant be started break with http 500 error
 		} catch (Exception $e) {
-			if(!OC_Config::getValue('installed')) {
-				error_log('Session could not be initialized');
-			} else {
 			OC_Log::write('core', 'Session could not be initialized',
 				OC_Log::ERROR);
-			}
 			header('HTTP/1.1 500 Internal Server Error');
 			OC_Util::addStyle("styles");
 			$error = 'Session could not be initialized. Please contact your ';

lib/private/log/owncloud.php

@@ -59,10 +59,14 @@ class OC_Log_Owncloud {
 			}
 			$time = new DateTime(null, $timezone);
 			$entry=array('app'=>$app, 'message'=>$message, 'level'=>$level, 'time'=> $time->format($format));
+			$entry = json_encode($entry);
 			$handle = @fopen(self::$logFile, 'a');
 			if ($handle) {
-				fwrite($handle, json_encode($entry)."\n");
+				fwrite($handle, $entry."\n");
 				fclose($handle);
+			} else {
+				// Fall back to error_log
+				error_log($entry);
 			}
 		}
 	}