[REF] web: improve validation of comparison

Part-of: odoo/odoo#118057

addons/web/static/src/search/with_search/with_search.js

@@ -68,7 +68,7 @@ WithSearch.props = {
     display: { type: Object, optional: true },
 
     // search query elements
-    comparison: { validate: () => true, optional: true }, // fix problem with validation with type: [Object, null]
+    comparison: { type: [Object, { value: null }], optional: true },
     // Issue OWL: https://github.com/odoo/owl/issues/910
     context: { type: Object, optional: true },
     domain: { type: Array, element: [String, Array], optional: true },

addons/web/static/src/views/standard_view_props.js

@@ -20,7 +20,7 @@ export const standardViewProps = {
     arch: { type: String },
     bannerRoute: { type: String, optional: true },
     className: { type: String, optional: true },
-    comparison: { validate: () => true }, // fix problem with validation with type: [Object, null]
+    comparison: { type: [Object, { value: null }], optional: true },
     // Issue OWL: https://github.com/odoo/owl/issues/910
     context: { type: Object },
     createRecord: { type: Function, optional: true },