Avoid and intercept katex errors

1. Intercept katex error so that LDs after a bad LD are still displayed
2. Load katex also in readonly mode for reports

Closes #504

public/js/common.js

@@ -247,7 +247,11 @@ function updateMathMLContent(dom_id, data) {
 		$("#" + dom_id).html(data);
 	}
 	typesetHtmlFormulas(dom_id);
-	katexRenderAll();
+	try {
+		katexRenderAll();
+	} catch(e) {
+		console.log(e);
+	}
 }
 
 /**

resources/views/report/report.blade.php

@@ -47,11 +47,11 @@
 
         {!!  $helper->loadAsset("/libraries/epsilonwriter/ew_init.js")  !!}
         {!!  $helper->loadAsset("/libraries/epsilonwriter/EpsiWriter.css")  !!}
-        {!!  $helper->loadAsset("/libraries/tinymce/plugins/epsilon/katex.js") !!}
-        {!!  $helper->loadAsset("/libraries/tinymce/plugins/epsilon/katex.css") !!}
        
         {!!  $helper->loadAsset("/libraries/epsilonwriter/natives.js")  !!}
         <?php } ?>
+        {!!  $helper->loadAsset("/libraries/tinymce/plugins/epsilon/katex.js") !!}
+        {!!  $helper->loadAsset("/libraries/tinymce/plugins/epsilon/katex.css") !!}
 
         <!-- functions -->
         <?php