Fix bug where if `yrange` was passed the mxmin callback was still used..

piker/ui/_interaction.py

@@ -798,8 +798,13 @@ class ChartView(ViewBox):
 
         if set_range:
 
+            if not yrange:
+                # XXX: only compute the mxmn range
+                # if none is provided as input!
                 yrange = self._maxmin()
+
                 if yrange is None:
+                    log.warning(f'No yrange provided for {self.name}!?')
                     return
 
             ylow, yhigh = yrange