Verify props is array before using append

Author: Aubruz

Setup.py

@@ -4,7 +4,7 @@
 
 setup(
     name="mainframe-bot-api",
-    version="1.2.0",
+    version="1.2.2",
     author="aubruz",
     author_email="[email protected]",
     packages=find_packages(),

mainframe/component.py

@@ -29,6 +29,8 @@ def _set_type(self, component_type):
     def _add_props(self, props: dict, append=False):
         for property_key, property_value in props.items():
             if append:
+                if self.json['props'].get(property_key) is None:
+                    self.json['props'][property_key] = []
                 self.json['props'][property_key].append(property_value)
             elif isinstance(property_value, dict) and len(property_value):
                 for key, value in property_value.items():