Don't crash when migrating users with blank name

Some users are registered with just a username and no actual name. The
old way only dealt with users with just first or last name - not the
ones completely without name.

pgweb/util/auth.py

@@ -34,6 +34,7 @@ class AuthBackend(ModelBackend):
 				# create a user in the django system, and migrate all settings
 				# we can think of.
 				namepieces = rows[0][2].split(None, 2)
+				if len(namepieces) == 0: namepieces = ['', '']
 				if len(namepieces) == 1: namepieces.append('')
 				user = User(username=username.lower(), email=rows[0][3], first_name=namepieces[0], last_name=namepieces[1])
 				user.set_password(password)