explicitly checking EOS authorization key, style fixes

core/src/apps/eos/writers.py

@@ -1,3 +1,5 @@
+from trezor import wire
+
 from apps.common.writers import (
     write_bytes_fixed,
     write_bytes_unchecked,
@@ -35,7 +37,8 @@ def write_auth(w: Writer, auth: EosAuthorization) -> None:
     write_uint32_le(w, auth.threshold)
     write_uvarint(w, len(auth.keys))
     for key in auth.keys:
-        assert key.key is not None
+        if key.key is None:
+            raise wire.DataError("Key must be provided explicitly.")
         write_uvarint(w, key.type)
         write_bytes_fixed(w, key.key, 33)
         write_uint16_le(w, key.weight)

core/src/apps/nem/mosaic/layout.py

@@ -86,15 +86,11 @@ async def require_confirm_properties(
 
     # levy
     if definition.levy:
-        assert (
-            definition.levy_address is not None
-        )  # nem.validators._validate_mosaic_creation
-        assert (
-            definition.levy_namespace is not None
-        )  # nem.validators._validate_mosaic_creation
-        assert (
-            definition.levy_mosaic is not None
-        )  # nem.validators._validate_mosaic_creation
+        # asserts below checked in nem.validators._validate_mosaic_creation
+        assert definition.levy_address is not None
+        assert definition.levy_namespace is not None
+        assert definition.levy_mosaic is not None
+
         properties.append(("Levy recipient:", definition.levy_address))
 
         properties.append(("Levy fee:", str(definition.fee)))