Actually remove DAEmptys from interview dict

Should have already happened in jhpyle/docassemble#877,
but that patch isn't working for some reason. Interviews will still error when
trying to view the variables and values, but it shouldn't error when trying to
send the info with `requests` now.

Author: BryceStevenWilley

docassemble/EFSPIntegration/efm_client.py

@@ -14,6 +14,7 @@
     Person,
     Individual,
     DAStore,
+    DAEmpty,
     DADateTime,
     as_datetime,
     reconsider,
@@ -92,6 +93,14 @@ def _give_data_url(bundle: ALDocumentBundle, key: str = "final") -> None:
                     )
                 doc.page_count = doc_pdf.num_pages()
 
+def _remove_all_da_emptys(json_val):
+    if isinstance(json_val, DAEmpty):
+        return None
+    if isinstance(json_val, list):
+        return [_remove_all_da_emptys(v) for v in json_val]
+    if isinstance(json_val, dict):
+        return {k: _remove_all_da_emptys(v) for k, v in json_val.items()}
+    return json_val
 
 def _get_all_vars(bundle: ALDocumentBundle, key: str = "final") -> Dict:
     """Strips out some extra big variables that we don't need to serialize and send across the network"""
@@ -132,6 +141,8 @@ def _get_all_vars(bundle: ALDocumentBundle, key: str = "final") -> Dict:
     for var in vars_to_pop:
         all_vars_dict.pop(var, None)
 
+    all_vars_dict = _remove_all_da_emptys(all_vars_dict)
+
     for doc in all_vars_dict.get("al_court_bundle", {}).get("elements", []):
         doc.pop("optional_service_options", None)
         doc.pop("document_type_options", None)