Fixed unit test

Author: ctmay4

src/main/java/com/imsweb/seerapi/client/staging/SchemaLookup.java

@@ -68,7 +68,7 @@ public String getInput(String key) {
      * @param value value of input
      */
     public void setInput(String key, String value) {
-        if (getAllowedKeys() != null && !getAllowedKeys().contains(key))
+        if (!getAllowedKeys().isEmpty() && !getAllowedKeys().contains(key))
             throw new IllegalStateException("The input key " + key + " is not allowed for lookups");
 
         _inputs.put(key, value);