Throw JSON error if table lacks a default_action key, or action_data

Signed-off-by: Andy Fingerhut <[email protected]>

Author: jafingerhut

src/bm_sim/P4Objects.cpp

@@ -1947,7 +1947,17 @@ P4Objects::init_pipelines(const Json::Value &cfg_root,
 
           table->set_default_default_entry(action, std::move(adata),
                                            is_action_entry_const);
+        } else {
+          throw json_exception(
+              EFormat() << "'default_action' of table '" << table_name
+              << "' should have key 'action_data'",
+              cfg_default_entry);
         }
+      } else {
+        throw json_exception(
+            EFormat() << "Table '" << table_name << "' should have key"
+            << " 'default_action'",
+            cfg_table);
       }
 
       // for 'simple' tables, it is possible to specify immutable entries