Fix Symfony 4.2 deprecation#14

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hanishsingla wants to merge 2 commits intoHappyr:masterfrom

hanishsingla:master

Commits on May 4, 2019

Merge pull request #1 from Happyr/master
hanishsingla
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Commits on Nov 21, 2019

Fix: A tree builder without a root node is deprecated since Symfony 4.2 and will not be supported anymore in 5.0.
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