email: Fix possible crash if no body in email

include/class.mailfetch.php

@@ -541,7 +541,8 @@ class MailFetcher {
             $body = new TextThreadBody(
                     Format::html2text(Format::safe_html($html),
                         100, false));
-        else
+
+        if (!isset($body))
             $body = new TextThreadBody('');
 
         if ($cfg->stripQuotedReply())

include/class.mailparse.php

@@ -292,7 +292,8 @@ class Mail_Parse {
             $body = new TextThreadBody(
                     Format::html2text(Format::safe_html($html),
                         100, false));
-        else
+
+        if (!isset($body))
             $body = new TextThreadBody('');
 
         if ($cfg && $cfg->stripQuotedReply())