* [TF FE] Fix TF1 SSD PPN model conversion It contains a case when one Merge node eliminated different conditional flows. Signed-off-by: Kazantsev, Roman <roman.kazantsev@intel.com> * Add layer test Signed-off-by: Kazantsev, Roman <roman.kazantsev@intel.com> --------- Signed-off-by: Kazantsev, Roman <roman.kazantsev@intel.com>