utils : fix datacite error formater because a keyerror was raised

datacite/utils.py

@@ -34,8 +34,15 @@ def format_error_from_datacite(error: dict) -> str:
     :param error: error from datacite
     :return: the formated error
     """
-    try:
-        description = error["title"].split("]")[1].split(" at line")[0]
-    except IndexError:
-        description = error["title"]
-    return f"\t\u27a5 {error['source']}  -->  {description}"
+    if "source" in error and "title" in error:
+        try:
+            return (
+                f"\t\u27a5 {error['source']}  --> "
+                f" {error['title'].split(']')[1].split(' at line')[0]}"
+            )
+        except IndexError:
+            return f"\t\u27a5 {error['source']}  -->  {error['title']}"
+    elif "title" in error:
+        return f"\t\u27a5 {error['title']}"
+    else:
+        return f"\t\u27a5 {error}"