fix(admin): fix import user with csv with no group assigned

admin/src/admin/lib/admin.py

@@ -584,8 +584,8 @@ class Admin:
                 + ") uploaded user: "
                 + u["username"]
             )
-            user_groups = [g.strip() for g in u["groups"].split(",")]
-
+            user_groups = [g.strip() for g in u["groups"].split(",") if g !=""]
+            if not len(user_groups): user_groups = ["/"+u["role"].strip()]
             pathslist = []
             for group in user_groups:
                 pathpart = ""
@@ -637,6 +637,7 @@ class Admin:
         groups = list(dict.fromkeys(groups))
         sysgroups = []
         for g in groups:
+            if g != "":
                 sysgroups.append(
                     {
                         "provider": "external",