Fix to prevent 500 error when course mode currency is not the same as the one configured from ansible settings

refactor: added default=0 to min function

fix: added parenthesis to list generation

refactor: deleted unnecesary try/except

refactor: deleted list gunction into generator
(cherry picked from commit 9d678442ab5ee6afc1240c6741e5cbb745fea246)

Author: jfavellar90

common/djangoapps/course_modes/models.py

@@ -766,7 +766,10 @@ def min_course_price_for_currency(cls, course_id, currency):
         If there is no mode found, will return the price of DEFAULT_MODE, which is 0
         """
         modes = cls.modes_for_course(course_id)
-        return min(mode.min_price for mode in modes if mode.currency.lower() == currency.lower())
+        return min(
+            (mode.min_price for mode in modes if mode.currency.lower() == currency.lower()),
+            default=0
+        )
 
     @classmethod
     def is_eligible_for_certificate(cls, mode_slug, status=None):