fix(signature-footer): fall back to system default when inherited template is empty

When all admin-level customizations are deleted, the policy's
inheritedValue has an empty footerTemplate. Previously resolveEditorProps
unconditionally overrode baseEditorProps.inheritedTemplate with that
empty string, silently discarding the system-level default injected by
PHP via loadState('libresign', 'footer_template', '').

Now resolveEditorProps only overrides inheritedTemplate when the
inherited level provides a non-empty custom footer template. Otherwise
it falls back to baseEditorProps.inheritedTemplate, preserving the real
system default so the user reset button always restores a meaningful
value instead of blank.

Signed-off-by: Vitor Mattos <[email protected]>

Author: vitormattos

src/views/Settings/PolicyWorkbench/settings/signature-footer/realDefinition.ts

@@ -27,11 +27,17 @@ export const signatureFooterRealDefinition: RealPolicySettingDefinition = {
 	},
 	resolveEditorProps: (policy: EffectivePolicyState | null, baseEditorProps: Record<string, unknown>) => {
 		const policyWithInherited = policy as (EffectivePolicyState & { inheritedValue?: EffectivePolicyValue }) | null
-		const normalizedInherited = normalizeSignatureFooterPolicyConfig(policyWithInherited?.inheritedValue ?? null)
-		if (normalizedInherited.footerTemplate) {
+		if (policyWithInherited && Object.prototype.hasOwnProperty.call(policyWithInherited, 'inheritedValue')) {
+			const normalizedInherited = normalizeSignatureFooterPolicyConfig(policyWithInherited.inheritedValue ?? null)
+			// Only override the base inheritedTemplate when the inherited policy level provides a non-empty
+			// custom footer template. Otherwise fall back to the base (which carries the system-level
+			// footer_template from loadState) so the user always sees the real default instead of blank.
+			const resolvedTemplate = normalizedInherited.footerTemplate.trim() !== ''
+				? normalizedInherited.footerTemplate
+				: (baseEditorProps.inheritedTemplate as string | undefined) ?? ''
 			return {
 				...baseEditorProps,
-				inheritedTemplate: normalizedInherited.footerTemplate,
+				inheritedTemplate: resolvedTemplate,
 			}
 		}