Temporary workaround for issue where image metadata is missing

This seems to be due to Omeka's getID3() function failing. Now we
fall back to the PHP getimagesize() function if the Omeka image
metadata is not available.

TODO: figure out why the image metadata doesn't get extracted here.

helpers/TeiEditions_Helpers_View.php

@@ -155,13 +155,7 @@ function tei_editions_render_document_images($item)
     $images = [];
     foreach ($item->getFiles() as $file) {
         if (preg_match('/.+\.(png|jpg|tif)$/', $file->original_filename)) {
-            $res = '';
-            if ($file->metadata != '') {
-                $info = json_decode($file->metadata, true);
-                if (isset($info["video"]) and isset($info["video"]["resolution_x"])) {
-                    $res = $info["video"]["resolution_x"] . 'x' . $info["video"]["resolution_y"];
-                }
-            }
+            $res = tei_editions_get_image_sizes($file);
             $images[] = [
                 "path" => $file->getWebPath(),
                 "thumb" => $file->getWebPath("thumbnail"),
@@ -348,4 +342,20 @@ function tei_editions_render_map($data, $width = 425, $height = 350)
         // TODO
     }
     return "";
+}
+
+function tei_editions_get_image_sizes($file)
+{
+    if ($file->metadata != '') {
+        $info = json_decode($file->metadata, true);
+        if (isset($info["video"]) and isset($info["video"]["resolution_x"])) {
+            return $info["video"]["resolution_x"] . 'x' . $info["video"]["resolution_y"];
+        }
+    }
+
+    // Log an error here because metadata has not been correctly
+    // set for this file.
+    error_log("No metadata for file: " . $file->original_filename);
+    $size = getimagesize($file->getWebPath());
+    return $size[0] . 'x' . $size[1];
 }