Port mapping problem for 7.1 transponders with client ports

There seems to be bug with regard to the port-mapping code for 7.1 device models.

This bug appears only when there exists switch-client ports, say for example 4x100G muxponders. The 7.1 switch-client ports can support two if-capabilities

(1) 100GE

(2) 100GE-ODU4

(3) 100GE-OCH-OTU4-ODU4

For 100GE if-cap, there is no otn-capability container and is causing a null-pointer exception for the current code structure.