Added fail safes

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

@@ -1739,7 +1739,8 @@ public class HtmlHelper {
 
         String ns = null;
         for (Element h : parsed.select("html"))
-            for (Attribute a : h.attributes()) {
+            for (Attribute a : h.attributes())
+                try {
                     String key = a.getKey();
                     String value = a.getValue().toLowerCase(Locale.ROOT);
                     if ("xmlns".equals(key) && value.contains(W3NS)) {
@@ -1749,9 +1750,12 @@ public class HtmlHelper {
                         ns = key.split(":")[1];
                         break;
                     }
+                } catch (Throwable ex) {
+                    Log.e(ex);
                 }
 
-        for (Element e : parsed.select("*")) {
+        for (Element e : parsed.select("*"))
+            try {
                 String tag = e.tagName();
                 if (tag.contains(":")) {
                     boolean show = (ns == null || tag.startsWith(ns) ||
@@ -1793,6 +1797,8 @@ public class HtmlHelper {
                         }
                     }
                 }
+            } catch (Throwable ex) {
+                Log.e(ex);
             }
     }