Add input errors for img, link, script

layouts/partials/paige/img.html

@@ -20,6 +20,10 @@
 {{ $title := $params.title }}
 {{ $width := $params.width }}
 
+{{ if and (not $src) (not $resource) }}
+    {{ errorf "paige/img: no src or resource" }}
+{{ end }}
+
 {{ $intrinsicheight := $height }}
 {{ $intrinsicwidth := $width }}
 

layouts/partials/paige/link.html

@@ -11,6 +11,10 @@
 {{ $referrerpolicy := $params.referrerpolicy | default "no-referrer" }}
 {{ $sass := $params.sass }}
 
+{{ if not $href }}
+    {{ errorf "paige/link: no href" }}
+{{ end }}
+
 {{ if not $raw }}
     {{ $resource := partial "paige/resource.html" (dict
         "page" $page

layouts/partials/paige/script.html

@@ -9,6 +9,10 @@
 {{ $raw := $params.raw }}
 {{ $src := $params.src }}
 
+{{ if not $src }}
+    {{ errorf "paige/script: no src" }}
+{{ end }}
+
 {{ if $raw }}
     {{ $src = $src }}
 {{ else }}