fix condition to show badge correctly

Author: haschek

CHANGELOG.md

@@ -62,6 +62,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 -   `<MultiSuggestField />`
     -   `onSelection` now sets `newlySelected` only for add actions and no longer sets it to the last element
     -   border of the BlueprintJS `Tag` elements were fixed
+-   `<Button />`
+    -   badge is correctly displayed when `badge={0}`
 -   Focus outlines
     -   we use again bold focus outlines for input elements
     -   they are also used for clickable elements that are focused via keyboard (tab navigation)

src/components/Button/Button.tsx

@@ -113,7 +113,7 @@ export const Button = ({
             rightIcon={typeof rightIcon === "string" ? <Icon name={rightIcon} /> : rightIcon}
         >
             {children}
-            {badge && (
+            {typeof badge !== "undefined" && (
                 <Badge
                     children={badge}
                     {...constructBadgeProperties({