FIX: Don't error when clicking on a custom link in community section (#22174)

app/assets/javascripts/discourse/app/components/sidebar/common/custom-section.hbs

@@ -17,11 +17,15 @@
         @prefixValue={{link.prefixValue}}
         @href={{link.value}}
         @class={{link.linkDragCss}}
-        {{draggable
+        {{(if
+          this.section.reorderable
+          (modifier
+            "draggable"
             didStartDrag=link.didStartDrag
             didEndDrag=link.didEndDrag
             dragMove=link.dragMove
-        }}
+          )
+        )}}
       />
     {{else}}
       <Sidebar::SectionLink
@@ -43,7 +47,7 @@
         @currentWhen={{link.currentWhen}}
         @class={{link.linkDragCss}}
         {{(if
-          link.didStartDrag
+          this.section.reorderable
           (modifier
             "draggable"
             didStartDrag=link.didStartDrag

app/assets/javascripts/discourse/app/lib/sidebar/community-section.js

@@ -44,6 +44,8 @@ export default class CommunitySection {
   @tracked links;
   @tracked moreLinks;
 
+  reorderable = false;
+
   constructor({ section, owner }) {
     setOwner(this, owner);
 

app/assets/javascripts/discourse/app/lib/sidebar/section.js

@@ -14,6 +14,8 @@ export default class Section {
   @tracked dragCss;
   @tracked links;
 
+  reorderable = true;
+
   constructor({ section, owner }) {
     setOwner(this, owner);