Revert "allow query like chr17:7,578,460, which has only a single basepair"
Revert "allow query like chr17:7,578,460, which has only a single basepair"

This reverts commit b892d7c9395871e7cfb2595bb223960ad13b1968.

acthp/ucsc-xena-client,acthp/ucsc-xena-client,ucscXena/ucsc-xena-client,ucscXena/ucsc-xena-client,ucscXena/ucsc-xena-client,ucscXena/ucsc-xena-client,ucscXena/ucsc-xena-client,acthp/ucsc-xena-client