function plainAddPlaceholder remove metadata of pdf (#36)

[cdebevotte]

Fix for: function plainAddPlaceholder remove metadata of pdf (#36)

[coveralls]

Pull Request Test Coverage Report for Build 343

• 11 of 11 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 339:	0.0%
Covered Lines:	308
Relevant Lines:	308

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💛 - Coveralls

[cdebevotte]

This is my first time doing a PR, I'm not very used to it :-)

[vbuch]

It's in develop. Will try to get it released these days. Thank you for the contribution @cdebevotte