Fix small errors (#75)

* fix error check

* fix exe optional parameter

Author: mmacata

src/actinia_module_plugin/api/processing.py

@@ -101,7 +101,7 @@ def set_actinia_modules(
                 module_pc = fillTemplateFromProcessChain(
                     module["module"],
                     kwargs,
-                )["list"]
+                )
                 if isinstance(module_pc, str):
                     # then return value is a missing attribute
                     msg = (
@@ -118,7 +118,7 @@ def set_actinia_modules(
                     ac_module_pc = set_actinia_modules(
                         self,
                         rdc,
-                        module_pc,
+                        module_pc["list"],
                         grass_module_list,
                         actinia_module_list,
                     )

src/actinia_module_plugin/core/modules/actinia_common.py

@@ -386,7 +386,7 @@ def transformPlaceholder(self, placeholderCollector):
             exe_param = {}
             exe_param["name"] = param
             exe_param["description"] = "Simple parameter from executable"
-            exe_param["required"] = True
+            exe_param["optional"] = False
             exe_param["schema"] = {"type": "string"}
             add_param_description(exe_param, "exe", dict())
             self.vm_params.append(exe_param)