[Xorp-hackers] Tiny patch to detect missing operators to prevent logic error / unreachable code crash

[Marat Nepomnyashy]

Hi Pavlin,

Please consider the attached patch for inclusion.

Patch prevents an unreachable code crash in file rtrmgr/config_operators.cc 
method operator_to_str(...).

Patch modifies file rtrmgr/template_base_command.cc, method 
AllowOperatorsCommand::verify_variables(...), that is shallower in the call 
stack from where the crash occurs, to return false when the ConfigOperator 
is OP_NONE, signaling that the configuration node is not valid and 
preventing the execution from reaching the point of crash.

Thanks,
Marat
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