Fix bug in update_dict()

nbcourse/nbcourse.py

@@ -48,6 +48,12 @@ class NbCourse:
                     'slug_title': 'course',
                     'output_dir': 'build',
                     'title': 'A course',
+                    'subtitle': None,
+                    'favicon': None,
+                    'picture': None,
+                    'authors': [],
+                    'chapter_preview_only': [],
+                    'license': None,
                     'links': [{
                         'title': 'Manual',
                         'target': 'manual.html',

nbcourse/utils.py

@@ -33,7 +33,7 @@ def clean_tree(target):
 def update_dict(current: dict, new: dict):
     """Update current multi-level dict with new dict"""
     for k, v in new.items():
-        if k in current and type(v) is dict:
+        if k in current and type(current[k]) is dict and type(v) is dict:
             # Update current entry by descending into sub dict
             update_dict(current[k], v)
         else: