send_data call in registeredMetric doesn`t handle exceptions

[KohliDev]

send_data stops sending the data once it receives the exception from DCC_Comms only the collector thread keeps on working:

2017-10-17 19:43:27 UTC 1900 INFO [SendThread] liota.entities.metrics.registered_metric.send_data(120) - Publishing values for the resource Network Bytes Received 
2017-10-17 19:43:27 UTC 1900 ERROR [SendThread] liota.lib.transports.mqtt.publish(324) - MQTT Publish exception:4 result code
None
2017-10-17 19:43:27 UTC 1900 ERROR [SendThread] liota.lib.transports.mqtt.publish(327) - MQTT Publish exception
Traceback (most recent call last):
  File "build/bdist.linux-x86_64/egg/liota/lib/transports/mqtt.py", line 325, in publish
    raise Exception("MQTT Publish exception:{0} result code".format(mess_info.rc))
Exception: MQTT Publish exception:4 result code
2017-10-17 19:43:27 UTC 1900 INFO [Collector-30] liota.entities.metrics.registered_metric.collect(111) - Disk Usage Stats Sample Value: 78133.0
2017-10-17 19:43:28 UTC 1900 INFO [Collector-28] liota.entities.metrics.registered_metric.collect(111) - CPU Utilization Sample Value: 4.48
2017-10-17 19:43:32 UTC 1900 INFO [Collector-3] liota.entities.metrics.registered_metric.collect(111) - CPU Process Sample Value: 3
2017-10-17 19:43:32 UTC 1900 INFO [Collector-6] liota.entities.metrics.registered_metric.collect(111) - Network Bytes Received Sample Value: 1171826.0
2017-10-17 19:43:32 UTC 1900 INFO [Collector-1] liota.entities.metrics.registered_metric.collect(111) - Memory Free Sample Value: 62.1
2017-10-17 19:43:32 UTC 1900 INFO [Collector-3] liota.entities.metrics.registered_metric.collect(111) - Disk Usage Stats Sample Value: 78135.0
2017-10-17 19:43:33 UTC 1900 INFO [Collector-4] liota.entities.metrics.registered_metric.collect(111) - CPU Utilization Sample Value: 3.77
2017-10-17 19:43:37 UTC 1900 INFO [Collector-11] liota.entities.metrics.registered_metric.collect(111) - CPU Process Sample Value: 3
2017-10-17 19:43:37 UTC 1900 INFO [Collector-11] liota.entities.metrics.registered_metric.collect(111) - Disk Usage Stats Sample Value: 78135.0

It doesn`t start sending after the re-connection as well.