More robust detection of Anki package being installed

Previously a typo caused a ModuleNotFoundError even though Anki was
installed.

anki_roam_import/anki.py

@@ -3,13 +3,25 @@
 from dataclasses import dataclass
 from typing import Iterable, Optional
 
-try:
+from .model import JsonData, AnkiNote
+
+
+def is_anki_package_installed() -> bool:
+    try:
+        import anki
+    except ModuleNotFoundError:
+        return False
+    else:
+        return True
+
+
+if is_anki_package_installed():
     from anki.collection import _Collection
+    from anki.models import NoteType
     from anki.notes import Note
-    from anki.types import NoteType
     from anki.utils import splitFields
     from aqt.main import AnkiQt
-except ModuleNotFoundError:
+else:
     # allow running tests without anki package installed
     from typing import Any, Dict
 
@@ -25,8 +37,6 @@ def __init__(self, collection, model):
     def splitFields(fields):
         return []
 
-from .model import JsonData, AnkiNote
-
 
 @dataclass
 class AnkiModelNotes:

anki_roam_import/importer.py

@@ -4,18 +4,20 @@
 from dataclasses import dataclass
 from typing import Iterable, List
 
-try:
+from .anki import (
+    AnkiAddonData, AnkiCollection, AnkiModelNotes, is_anki_package_installed,
+)
+from .anki_format import make_anki_note
+from .model import AnkiNote
+from .roam import extract_roam_blocks, load_roam_pages
+
+if is_anki_package_installed():
     from anki.utils import stripHTMLMedia
-except ModuleNotFoundError:
+else:
     # allow running tests without anki package installed
     # noinspection PyPep8Naming
     def stripHTMLMedia(content): return content
 
-from .anki import AnkiAddonData, AnkiCollection, AnkiModelNotes
-from .model import AnkiNote
-from .roam import load_roam_pages, extract_roam_blocks
-from .anki_format import make_anki_note
-
 
 @dataclass
 class AnkiNoteImporter: