fix: handle empty/whitespace strings in parseGoDurationToMs

The parseGoDurationToMs function was throwing errors for empty strings
and whitespace-only strings, but these should return 0 duration.
This was causing failures in public-api tests that expect empty strings
to be converted to 0 duration.

- Handle empty or whitespace-only strings as 0 duration
- Maintain existing error handling for invalid duration formats
- All tests now pass (108/108 gitpod-protocol, 87/87 public-api)

Co-authored-by: Ona <[email protected]>

Author: corneliusludmann

components/gitpod-protocol/src/util/timeutil.ts

@@ -117,6 +117,11 @@ export function goDurationToHumanReadable(goDuration: string): string {
 }
 
 export function parseGoDurationToMs(goDuration: string): number {
+    // Handle empty or whitespace-only strings as 0 duration
+    if (!goDuration || goDuration.trim() === "") {
+        return 0;
+    }
+
     const result = parseDuration(goDuration);
     if (result === null || result === undefined) {
         throw new Error(`Invalid Go duration format: ${goDuration}`);