clean(ec tree): remove "-" form tree
clean(ec tree): remove "-" form tree

bmesuere/uni-test,bmesuere/uni-test,unipept/unipept,bmesuere/uni-test,unipept/unipept,unipept/unipept,unipept/unipept,bmesuere/uni-test,bmesuere/uni-test,unipept/unipept