Fixed problems in the function 'vario' when the community matrix only contains a single species. These changes were not necessary when we explicitly forced the community matrix to be of class 'matrix'.
Fixed problems in the function 'vario' when the community matrix only contains a single species. These changes were not necessary when we explicitly forced the community matrix to be of class 'matrix'.

weecology/mete-spatial,weecology/mete-spatial,weecology/mete-spatial,weecology/mete-spatial