Plot axes do not show labels when no data

Added semicolon

Added test for hasDomainData()

Added test for negative case on domain data check

Removed label test due to mocked telemetry formatter

Uncommented test commented by accident

Removed extra space

platform/features/plot/src/elements/PlotTickGenerator.js

@@ -53,7 +53,8 @@ define(
 
             for (i = 0; i < count; i += 1) {
                 result.push({
-                    label: format(i * step + start)
+                    //If data to show, display label for each tick line, otherwise show lines but suppress labels.
+                    label: span > 0 ? format(i * step + start) : ''
                 });
             }