Html helper failsafe

app/src/main/java/eu/faircode/email/HtmlHelper.java

@@ -2026,10 +2026,12 @@ public class HtmlHelper {
                     }
 
                     // Apply element
+                    try {
                         String tag = element.tagName();
                         int semi = tag.indexOf(':');
                         if (semi >= 0)
                             tag = tag.substring(semi + 1);
+
                         switch (tag) {
                             case "a":
                                 String href = element.attr("href");
@@ -2166,6 +2168,9 @@ public class HtmlHelper {
                                 if (warn)
                                     Log.e("Unknown tag=" + element.tagName());
                         }
+                    } catch (Throwable ex) {
+                        Log.e(ex);
+                    }
                 }
             }