[FIX] web: MonetaryField: can take 0 value

Before that commit a zero value for a monetary field would be wrongly
considered invalid. This would block many flows (e.g. a save).

Part-of: odoo/odoo#78221

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

@@ -353,6 +353,7 @@ export class Record extends DataPoint {
                 case "boolean":
                 case "float":
                 case "integer":
+                case "monetary":
                     continue;
                 case "one2many":
                 case "many2many":

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

@@ -563,6 +563,7 @@ export class Record extends DataPoint {
                 case "boolean":
                 case "float":
                 case "integer":
+                case "monetary":
                     continue;
                 case "one2many":
                 case "many2many":

addons/web/static/tests/views/fields/monetary_field_tests.js

@@ -1140,4 +1140,24 @@ QUnit.module("Fields", (hooks) => {
             "Placeholder"
         );
     });
+
+    QUnit.test("required monetary field with zero value", async function (assert) {
+        await makeView({
+            type: "form",
+            resModel: "partner",
+            serverData,
+            arch: `
+                <form>
+                    <field name="monetary_field" required="1"/>
+                </form>`,
+        });
+
+        assert.containsOnce(target, ".o_form_editable");
+        assert.strictEqual(target.querySelector("[name=monetary_field] input").value, "0.00");
+
+        await clickSave(target);
+
+        assert.containsOnce(target, ".o_form_readonly");
+        assert.strictEqual(target.querySelector("[name=monetary_field] span").innerText, "0.00");
+    });
 });