Clear library cache and try retrieving library again

Author: JonnyWong16

plexapi/library.py

@@ -96,7 +96,12 @@ def section(self, title):
         try:
             sections = self._sectionsByTitle[normalized_title]
         except KeyError:
-            raise NotFound(f'Invalid library section: {title}') from None
+            # Invalidate cached libraries and try again
+            self._invalidateCachedProperties()
+            try:
+                sections = self._sectionsByTitle[normalized_title]
+            except KeyError:
+                raise NotFound(f'Invalid library section: {title}') from None
 
         if len(sections) > 1:
             warnings.warn(
@@ -117,7 +122,12 @@ def sectionByID(self, sectionID):
         try:
             return self._sectionsByID[sectionID]
         except KeyError:
-            raise NotFound(f'Invalid library sectionID: {sectionID}') from None
+            # Invalidate cached libraries and try again
+            self._invalidateCachedProperties()
+            try:
+                return self._sectionsByID[sectionID]
+            except KeyError:
+                raise NotFound(f'Invalid library sectionID: {sectionID}') from None
 
     def hubs(self, sectionID=None, identifier=None, **kwargs):
         """ Returns a list of :class:`~plexapi.library.Hub` across all library sections.