Fix problems with videos that do not have 720p mode

src/you_get/extractors/dailymotion.py

@@ -13,9 +13,12 @@ def dailymotion_download(url, output_dir = '.', merge = True, info_only = False)
     title = match1(html, r'"title"\s*:\s*"(.+?)",')
 
     for quality in ['720','480','380','240','auto']:
+        try:
             real_url = info[quality][0]["url"]
             if real_url:
                 break
+        except KeyError:
+            pass
 
     type, ext, size = url_info(real_url)