fix variable name and undefined index notice

apps/gallery/templates/index.php

@@ -82,7 +82,7 @@ sort($images);
 $arr = array();
 $tl = new \OC\Pictures\TilesLine();
 $ts = new \OC\Pictures\TileStack(array(), '');
-$previous_element = $images[0];
+$previous_element = @$images[0];
 for($i = 0; $i < count($images); $i++) {
 	$prev_dir_arr = explode('/', $previous_element);
 	$dir_arr = explode('/', $images[$i]);

lib/image.php

@@ -409,7 +409,7 @@ class OC_Image {
 			default:
 			
 				// this is mostly file created from encrypted file
-				$this->resource = imagecreatefromstring(\OC_Filesystem::file_get_contents(\OC_Filesystem::getLocalPath($newimgpath)));
+				$this->resource = imagecreatefromstring(\OC_Filesystem::file_get_contents(\OC_Filesystem::getLocalPath($imagepath)));
 				$itype = IMAGETYPE_PNG;
 				OC_Log::write('core','OC_Image->loadFromFile, Default', OC_Log::DEBUG);
 				break;