fix: cleanup bookshop output to enable empty content warning

Author: markdumay

layouts/_partials/utilities/RenderContentBlocks.html

@@ -61,4 +61,4 @@
 {{ end }}
 
 {{/* Render content blocks */}}
-{{ partial "bookshop_partial" (slice "page" $blocks) }}
+{{ return trim (partial "bookshop_partial" (slice "page" $blocks)) "\n\r " }}

layouts/single.html

@@ -17,7 +17,7 @@ <h5 class="offcanvas-title" id="offcanvas-label">{{ strings.FirstUpper $.Section
 
     {{ $blocks | safeHTML }}
 
-    {{ if or (not $blocks) (gt (len .RawContent) 0) }}
+    {{ if (gt (len .RawContent) 0) }}
         <div class="container-xxl flex-fill p-4 px-xxl-0">
             <div class="row row-cols-1 row-cols-{{ $breakpoint.current }}-2 row-cols-{{ $breakpoint.next }}-3">
                 <div class="col col-{{ $breakpoint.next }}-2 d-none d-{{ $breakpoint.next }}-block sidebar-overflow sticky-top pt-5">
@@ -35,5 +35,7 @@ <h5 class="offcanvas-title" id="offcanvas-label">{{ strings.FirstUpper $.Section
                 </div>
             </div>
         </div>
+    {{ else if and (not $blocks) (eq (len .RawContent) 0)}}
+        {{ warnf "Page %q has no content" .RelPermalink }}
     {{ end }}
 {{ end -}}