Invalid JSON input type raises incorrect exceptions

Traces:

File "/opt/stack/designate/designate/objects/domain.py", line 175, in set_masters
    for m in masters:
TypeError: 'bool' object is not iterable

Steps to reproduce:

token=$(keystone token-get | grep ' id ' | awk '{ print $4 }')
endpoint=http://10.43.97.3:9001
curl -H "Content-Type: application/json" -H "X-Auth-Token:${token}" -X POST ${endpoint}/v2/zones -d '{"masters": false, "email": "<email address hidden>", "name": "jsonexample.com."}'; echo;

Traces:

File "/opt/stack/designate/designate/objects/rrdata_sshfp.py", line 54, in _from_string
    algorithm, fp_type, fingerprint = value.split(' ')
AttributeError: 'NoneType' object has no attribute 'split'

Steps to reproduce:

token=$(keystone token-get | grep ' id ' | awk '{ print $4 }')
endpoint=http://10.43.97.3:9001
zone_id=$(designate domain-list | awk '{ print $2 }' | grep -- -)
curl -H "Content-Type: application/json" -H "X-Auth-Token:${token}" -X POST ${endpoint}/v2/zones/${zone_id}/recordsets -d '{"records": [null], "type": "SSHFP", "name": "blah."}

Traces:

File "/usr/local/lib/python2.7/dist-packages/dns/rdtypes/txtbase.py", line 57, in from_text
    raise dns.exception.UnexpectedEnd

Steps to reproduce:

token=$(keystone token-get | grep ' id ' | awk '{ print $4 }')
endpoint=http://10.43.97.3:9001
zone_id=$(designate domain-list | awk '{ print $2 }' | grep -- - | head -n 1)
zone_name=$(designate domain-list | awk '{ print $4 }' | grep '\.$' | head -n 1)
curl -H "Content-Type: application/json" -H "X-Auth-Token:${token}" -X POST ${endpoint}/v2/zones/${zone_id}/recordsets -d '{"records": "1 2 blablabla", "type": "TXT", "name": "'$RANDOM.${zone_name}'"}'