default to populate max_effort with only 1 effort value present

course_discovery/apps/course_metadata/data_loaders/marketing_site.py

@@ -542,7 +542,7 @@ class CourseMarketingSiteDataLoader(AbstractMarketingSiteDataLoader):
 
         effort_values = [int(keyword) for keyword in re.split(r'\s|-|–|,|\+|~', effort_per_week) if keyword.isdigit()]
         if len(effort_values) == 1:
-            min_effort = effort_values[0]
+            max_effort = effort_values[0]
         if len(effort_values) == 2:
             min_effort = effort_values[0]
             max_effort = effort_values[1]

course_discovery/apps/course_metadata/data_loaders/tests/test_marketing_site.py

@@ -375,12 +375,12 @@ class CourseMarketingSiteDataLoaderTests(AbstractMarketingSiteDataLoaderTestMixi
         (None, None, None),
         ('Browse at your own pace.', None, None),
         ('1.5 - 3.5 hours/week', None, None),
-        ('8 hours/week', 8, None),
-        ('2.5-5 hours.', 5, None),
-        ('5+ hours per week', 5, None),
-        ('3 horas por semana', 3, None),
-        ('1 - 1.5 hours per week', 1, None),
-        ('6 hours of video/300 multiple choice questions', 6, None),
+        ('8 hours/week', None, 8),
+        ('2.5-5 hours.', None, 5),
+        ('5+ hours per week', None, 5),
+        ('3 horas por semana', None, 3),
+        ('1 - 1.5 hours per week', None, 1),
+        ('6 hours of video/300 multiple choice questions', None, 6),
         ('6 to 9 hours/week', 6, 9),
         ('4-6 hours per week', 4, 6),
         ('About 5-12 hrs/week.', 5, 12),