Bug 1573454 - Hide "Blocking" section header when there is a site exception. r=timhuang

Differential Revision: https://phabricator.services.mozilla.com/D41745

--HG--
extra : moz-landing-system : lando

browser/themes/shared/controlcenter/panel.inc.css

@@ -672,7 +672,7 @@ description#identity-popup-content-verifier,
   grid-row: 1;
 }
 
-.protections-popup-category.blocked:not([hidden]) ~ #protections-popup-blocking-section-header,
+#protections-popup:not([hasException]) .protections-popup-category.blocked:not([hidden]) ~ #protections-popup-blocking-section-header,
 .protections-popup-category:not(.blocked):not([hidden]) ~ #protections-popup-not-blocking-section-header {
   display: flex;
 }