Allow napari GUI to accept custom weights (#460)

* Check if provided model is weights only and work around

* Period to commit

cellfinder/core/classify/classify.py

@@ -68,6 +68,14 @@ def main(
         workers=workers,
     )
 
+    if trained_model and trained_model.suffix == ".h5":
+        print(
+            "Weights provided in place of the model, "
+            "loading weights into default model."
+        )
+        model_weights = trained_model
+        trained_model = None
+
     model = get_model(
         existing_model=trained_model,
         model_weights=model_weights,