fix(PrismCode): accept nullish values (#693)

Author: tenphi

.changeset/fair-cycles-design.md

@@ -0,0 +1,5 @@
+---
+"@cube-dev/ui-kit": patch
+---
+
+Allow PrismCode to accept nullish values if they are passed.

src/components/content/PrismCode/PrismCode.tsx

@@ -80,7 +80,11 @@ function isDiffCode(code: string): boolean {
 }
 
 function PrismCode(props: CubePrismCodeProps, ref) {
-  const { code = '', language = 'javascript', ...otherProps } = props;
+  let { code = '', language = 'javascript', ...otherProps } = props;
+
+  if (!code) {
+    code = '';
+  }
 
   if (typeof code !== 'string' && code) {
     throw new Error(