Update logix based on pr comment to check on error

Signed-off-by: Alistair Hey <[email protected]>

map_claims.go

@@ -13,12 +13,13 @@ type MapClaims map[string]interface{}
 // Compares the aud claim against cmp.
 // If required is false, this method will return true if the value matches or is unset
 func (m MapClaims) VerifyAudience(cmp string, req bool) bool {
-	aud, _ := m["aud"].([]string)
-
-	// special case where aud is a single string not list of strings
-	if aud == nil {
-		strAud, _ := m["aud"].(string)
+	aud, ok := m["aud"].([]string)
+	if !ok {
+		strAud, ok := m["aud"].(string)
 		aud = append(aud, strAud)
+		if !ok {
+			return false
+		}
 	}
 
 	return verifyAud(aud, cmp, req)