Include nullish props in component schema (#272)

* feat(validation): add validation schema for props with no validation logic in createComponentDefinition function

* feat(react): include nullish props in component schema

* ensure only nullish props

Author: marklundin

.changeset/fair-guests-hide.md

@@ -0,0 +1,5 @@
+---
+"@playcanvas/react": patch
+---
+
+Include nullish props in component schema

packages/lib/src/utils/validation.ts

@@ -494,6 +494,15 @@ export function createComponentDefinition<T, InstanceType>(
                 default: value,
                 errorMsg: (val) => `Invalid value for prop "${String(key)}": "${JSON.stringify(val)}". Expected a Material.`,
             };
+        } else if(value === null) {
+            schema[key] = {
+                validate: () => true,
+                default: value,
+                errorMsg: () => '',
+                apply: (instance, props, key) => {
+                    (instance[key as keyof InstanceType] as unknown) = props[key];
+                }
+            };
         }
     });