Fix A tree builder without a root node is deprecated since Symfony 4.…#228

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AizeLeOuf wants to merge 1 commit intoschmittjoh:masterfrom AizeLeOuf:fix4.2_deprecated

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Commits on Mar 26, 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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