message: fix CustomElementProperty color theme
diff: @@ -66,7 +66,7 @@ namespace CustomElementProperty {
  })
  }
  - function createColorThemeProvider<T>(modelProperty: CustomModelProperty.Provider<{}, Value<T>>, getColor: (p: T) => Color, defaultColor: Color) {
  + function createColorThemeProvider<T>(modelProperty: CustomModelProperty.Provider<{}, Value<T>>, getColor: (p: T) => Color, defaultColor: Color): ColorTheme.Provider<{}> {
  function Coloring(ctx: ThemeDataContext, props: {}): ColorTheme<{}> {
  let color: LocationColor;
  @@ -103,7 +103,10 @@ namespace CustomElementProperty {
  factory: Coloring,
  getParams: () => ({}),
  defaultValues: {},
  - isApplicable: (ctx: ThemeDataContext) => !!ctx.structure && !!modelProperty.get(ctx.structure.models[0]).value
  + isApplicable: (ctx: ThemeDataContext) => !!ctx.structure && !!modelProperty.get(ctx.structure.models[0]).value,
  + ensureCustomProperties: (ctx: CustomProperty.Context, data: ThemeDataContext) => {
  + return data.structure ? modelProperty.attach(ctx, data.structure.models[0]) : Promise.resolve()
  + }
  }
  }
  