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Error with connectors block

See original GitHub issue

Deploying like this will cause an error:

---
team: "planetexpress"
source: "source"
projects:
  - name: "natas"
    consumers:
      - principal: "User:Bender"
      - principal: "User:Fry"
      - principal: "User:Lila"
    producers:
      - principal: "User:Fry"
      - principal: "User:Lila"
    connectors:
      - principal: "User:Connect1"
        topics:
          read:
            - "topicA"
            - "topicB"
      - principal: "User:Connect2"
        topics:
          write:
            - "topicC"
            - "topicD"
    topics:
      - name: "foo"
        config:
          replication.factor: "1"
          num.partitions: "1"
      - dataType: "avro"
        name: "bar"
        config:
          replication.factor: "1"
          num.partitions: "1"
    rbac:
      - ResourceOwner:
        - principal: "User:Professor"
      - DeveloperManage:
        - principal: "User:Zoidberg"

However removing the connectors block will work.

kafka-topology-builder.sh --brokers localhost:9093 --clientConfig topology.properties --topology topology_docs.yaml 
log4j:WARN No appenders could be found for logger (org.apache.kafka.clients.admin.AdminClientConfig).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Exception in thread "main" java.lang.NullPointerException
        at com.purbon.kafka.topology.api.mds.MDSApiClient.getClusterIds(MDSApiClient.java:202)
        at com.purbon.kafka.topology.roles.AdminRoleRunner.forKafkaConnect(AdminRoleRunner.java:54)
        at com.purbon.kafka.topology.roles.RBACProvider.setAclsForConnect(RBACProvider.java:61)
        at com.purbon.kafka.topology.AccessControlManager.syncApplicationAcls(AccessControlManager.java:157)
        at com.purbon.kafka.topology.AccessControlManager.lambda$sync$2(AccessControlManager.java:107)
        at java.util.ArrayList.forEach(ArrayList.java:1257)
        at com.purbon.kafka.topology.AccessControlManager.lambda$sync$3(AccessControlManager.java:105)
        at java.util.ArrayList.forEach(ArrayList.java:1257)
        at com.purbon.kafka.topology.AccessControlManager.sync(AccessControlManager.java:74)
        at com.purbon.kafka.topology.KafkaTopologyBuilder.run(KafkaTopologyBuilder.java:87)
        at com.purbon.kafka.topology.BuilderCLI.processTopology(BuilderCLI.java:154)
        at com.purbon.kafka.topology.BuilderCLI.main(BuilderCLI.java:118)