Robustify `getLocation()`
Robustify `getLocation()`

- Invalid viewIds are caught
- Use first view on undefined viewId

hms-dbmi/4DN_matrix-viewer,hms-dbmi/higlass,hms-dbmi/higlass,hms-dbmi/4DN_matrix-viewer,hms-dbmi/higlass,hms-dbmi/4DN_matrix-viewer,hms-dbmi/higlass