Handle Opaque Tokens

Previously we assumed that tokens would contain a payload, which we parsed to log
expiration information. This assumption is not true for opaque tokens, and our parsing
caused a failure in that scenario. This commit adds a check for opaque tokens.

[resolves #1058]

Signed-off-by: Paul Harris <harrisp@vmware.com>

Author: twoseat

.idea/compiler.xml

@@ -148,6 +148,10 @@ private static String extractAccessToken(Map<String, String> payload) {
     }
 
     private static Optional<Claims> parseToken(String token) {
+        if (!token.contains(".")) {
+            return Optional.empty();
+        }
+
         try {
             String jws = token.substring(0, token.lastIndexOf('.') + 1);