Fix bug when load an one-node pose graph. #495
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Basic Info
Description of contribution in a few bullet points
Fixed the bug of ceres-solver plugin that when load a one-node pose graph.
Although such a one-node pose graph is not normally loaded, this is really a bug that can crash the program. When a pose-graph only contain one node, which means that there is no constraint has been add in ceres problem. In this suitation
problem_->SetParameterBlockConstantwill abort the program.Description of documentation updates required from your changes
N/A
Future work that may be required in bullet points
N/A