tpp: Fix: Remove blank lines as the last pass.
tpp: Fix: Remove blank lines as the last pass.

This solves an issue whereby the remove blank lines pass would incorrectly
think it was seeing duplicates while these were actually being swallowed by a
later pass.

Closes JIRA CAMKES-392

smaccm/camkes-tool,agacek/camkes-tool,smaccm/camkes-tool,smaccm/camkes-tool,smaccm/camkes-tool,agacek/camkes-tool,agacek/camkes-tool