Getblocktemplate broken in v 0.1.10

./BGL-cli getblocktemplate '{"rules": ["segwit"]}'
error code: -1
error message:
basic_string::_M_construct null not valid

Compiled from source ( After fixing some configure errors.... )

Reproduce the reported ./BGL-cli getblocktemplate command with the segwit rules argument and capture the resulting error. Trace the getblocktemplate RPC handling to identify the source of the null string construction; done means the command returns a valid response instead of the basic_string error.

Written by the indexing model from the issue text.