Editing org.apache.karaf.shell/sshIdleTimeout results in NumberFormatException in fabric

Issue

• Editing org.apache.karaf.shell/sshIdleTimeout results in NumberFormatException in fabric

2016-08-17 03:55:21,508 | ERROR | che.karaf.shell) | KarafContainerRegistration       | 181 - io.fabric8.runtime.fabric-runtime-container-karaf-registration - 1.2.0.redhat-630159 | Cannot reconfigure container
java.lang.NumberFormatException: null
        at java.lang.Integer.parseInt(Integer.java:454)[:1.7.0_75]
        at java.lang.Integer.parseInt(Integer.java:527)[:1.7.0_75]
        at io.fabric8.runtime.container.karaf.KarafContainerRegistration.configurationEvent(KarafContainerRegistration.java:542)[181:io.fabric8.runtime.fabric-runtime-container-karaf-registration:1.2.0.redhat-630159]
        at org.apache.felix.cm.impl.ConfigurationManager$FireConfigurationEvent.sendEvent(ConfigurationManager.java:2036)[7:org.apache.felix.configadmin:1.8.4]
        at org.apache.felix.cm.impl.ConfigurationManager$FireConfigurationEvent.run(ConfigurationManager.java:2005)[7:org.apache.felix.configadmin:1.8.4]
        at org.apache.felix.cm.impl.UpdateThread.run(UpdateThread.java:103)[7:org.apache.felix.configadmin:1.8.4]
        at java.lang.Thread.run(Thread.java:745)[:1.7.0_75]