credID returned by authnrGetAssn() is optional if allowCreds has exac…

…tly 1 member fixes #472

index.bs

@@ -927,7 +927,7 @@ When this method is invoked, the user agent MUST execute the following algorithm
     1. While |issuedRequests| [=list/is not empty=], perform the following actions depending upon the |adjustedTimeout| timer
         and responses from the authenticators:
 
-        <dl class="switch">
+    <dl class="switch">
 
         :   If the |adjustedTimeout| timer expires,
         ::  [=set/For each=] |authenticator| in |issuedRequests| invoke the [=authenticatorCancel=] operation on |authenticator|
@@ -938,7 +938,6 @@ When this method is invoked, the user agent MUST execute the following algorithm
             2. [=set/For each=] remaining |authenticator| in |issuedRequests| invoke the [=authenticatorCancel=] operation on
                 |authenticator| and [=set/remove=] it from |issuedRequests|.
 
-
         :   If any |authenticator| returns an error status,
         ::  [=set/Remove=] |authenticator| from |issuedRequests|.
 
@@ -972,8 +971,7 @@ When this method is invoked, the user agent MUST execute the following algorithm
             3. [=set/For each=] remaining |authenticator| in |issuedRequests| invoke the [=authenticatorCancel=] operation on
                 |authenticator| and [=set/remove=] it from |issuedRequests|.
             4. Return |value| and terminate this algorithm.
-
-        </dl>
+    </dl>
 
 1. Return a {{DOMException}} whose name is "{{NotAllowedError}}".