initial-gravatars: fix case of dot beeing present before @domain.

rhodecode/lib/helpers.py

@@ -1151,7 +1151,7 b' class InitialsGravatar(object):'
 
         # check if prefix is maybe a 'first_name.last_name' syntax
         _dot_split = prefix.rsplit('.', 1)
-        if len(_dot_split) == 2:
+        if len(_dot_split) == 2 and _dot_split[1]:
             initials = [_dot_split[0][0], _dot_split[1][0]]
         else:
             initials = [prefix[0], server[0]]

rhodecode/tests/lib/test_libs.py

@@ -281,6 +281,7 b' def test_gravatar_url_builder(tmpl_url, '
         ('admin@', 'Marcin', 'Śuzminski', 'MS', '#aa00ff'),
         ('marcin.śuzminski', '', '', 'MS', '#402020'),
         ('null', '', '', 'NL', '#8c4646'),
+        ('[e-mail]', 'some', '', 'SA', '#664e33')
 ])
 def test_initials_gravatar_pick_of_initials_and_color_algo(
         email, first_name, last_name, expected_initials, expected_color):