Allow index entries that have no ruleid to associate themselves with a chapter.

asl_rulebook2/webapp/static/SearchResult.js

@@ -145,6 +145,8 @@ gMainApp.component( "index-sr", {
             // should state which chapter it came from, but this is way overkill for what we need. Instead,
             // we look at the ruleid and infer the chapter ID from the first letter (nb: we need to be careful
             // handle things like "KGP SSR 2" or "RB CG2".
+            if ( this.sr.chapter_id )
+                return this.sr.chapter_id ;
             let target = getPrimaryTarget( this.sr ) ;
             if ( ! target )
                 return null ;

asl_rulebook2/webapp/tests/fixtures/full/Kampfgruppe Scherer.index

@@ -3,6 +3,11 @@
 { "title": "Flugfeld Security Blocks, Sector G or Haarnadelkurve Block Bonus",
   "content": "Flugfeld Security Blocks: Blocks 4, 9, 14 and 17. See KGS CG1.",
   "ruleids": [ "KGS_CG1" ]
+},
+
+{ "title": "No ruleid",
+  "subtitle": "But is part of KGS.",
+  "chapter_id": "KGS"
 }
 
 ]