fix: Continuous legend properly disappears after coloring by continuo…

…us metadata and subsequently coloring by anything else (#513)

* branch init

* ensure colorbar is removed if asyncProps contains colorMode=color by categorical

* remove log

Co-authored-by: atarashansky <atarashansky@CZIMACOS3990.hsd1.ma.comcast.net>

client/src/components/continuousLegend/index.tsx

@@ -265,7 +265,11 @@ class ContinuousLegend extends React.Component<Props> {
               }
               this.cachedAsyncProps = asyncProps;
               // if asyncProps is null (no colorAccessor), remove legend
-              if (!asyncProps)
+              // or if colorMode is categorical, remove legend
+              if (
+                !asyncProps ||
+                asyncProps.colorMode === "color by categorical metadata"
+              )
                 d3.select("#continuous_legend").selectAll("*").remove();
               return null;
             }}