Make the blogger tests consistant with the wp ones - cast

to list in test if needed.

pelican/tools/pelican_import.py

@@ -771,6 +771,7 @@ def fields2pelican(
         wp_custpost=False, wp_attach=False, attachments=None):
 
     pandoc_version = get_pandoc_version()
+    posts_require_pandoc = []
 
     settings = read_settings()
     slug_subs = settings['SLUG_REGEX_SUBSTITUTIONS']
@@ -780,9 +781,7 @@ def fields2pelican(
         if filter_author and filter_author != author:
             continue
         if is_pandoc_needed(in_markup) and not pandoc_version:
-            error = ('Pandoc must be installed to complete the '
-                     'requested import action.')
-            exit(error)
+            posts_require_pandoc.append(filename)
 
         slug = not disable_slugs and filename or None
 
@@ -868,6 +867,11 @@ def fields2pelican(
 
         with open(out_filename, 'w', encoding='utf-8') as fs:
             fs.write(header + content)
+
+    if posts_require_pandoc:
+        logger.error("Pandoc must be installed to import the following posts:"
+                     "\n  {}".format("\n  ".join(posts_require_pandoc)))
+
     if wp_attach and attachments and None in attachments:
         print("downloading attachments that don't have a parent post")
         urls = attachments[None]