More progress on all entites in MW data load

lib/words.py

@@ -40,6 +40,7 @@ class Word:
     """All processing of a dictionary word."""
 
     _words: dict[str, WordType] = {}
+    _valid = False
 
     def __init__(self, word: str) -> None:
         #
@@ -62,14 +63,18 @@ class Word:
                 "definition": json.loads(query.value("definition")),
             }
             self.current = Word._words[word]
+            self._valid = True
             return
         #
         # The code should look at our settings to see if we have an API
         # key for MW to decide on the source to use.
         #
         source = "mw"
-
+        
         self._words[word] = discovered_plugins[source].fetch(word)
+        if self._words[word] is None:
+            self._valid = False
+            return
         self.current = Word._words[word]
         query.prepare(
             "INSERT INTO words "
@@ -81,8 +86,12 @@ class Word:
         query.bindValue(":definition", json.dumps(self.current["definition"]))
         if not query.exec():
             query_error(query)
+        self._valid = True
         return
 
+    def isValid(self) -> bool:
+        return self._valid
+    
     @pyqtSlot()
     def playSound(self) -> None:
         url = discovered_plugins[self.current["source"]].getFirstSound(