fix: handling of processor type in granite-io (#986)

Signed-off-by: Louis Mandel <[email protected]>

Author: mandel

src/pdl/pdl_granite_io.py

@@ -55,7 +55,7 @@ def processor_of_block(block: GraniteioModelBlock):
                 if processor.type is None:
                     processor_type = model
                 else:
-                    processor_type = value_of_expr(processor)
+                    processor_type = value_of_expr(processor.type)
 
                 assert isinstance(
                     processor_type, str