fix(auth-emailpass): better handle identity with same email error (#13537)

* fix(auth-emailpass): better handle identity with same email error

* add test

* Create blue-laws-argue.md

* check for empty object

* trueeee

* nit

* flip condition

.changeset/blue-laws-argue.md

@@ -0,0 +1,5 @@
+---
+"@medusajs/auth-emailpass": patch
+---
+
+fix(auth-emailpass): better handle identity with same email error