docs: public final @CheckForNull FilePath getSomeWorkspace() {
          R b = getSomeBuildWithWorkspace();
          if (b!=null) return b.getWorkspace();
          for (WorkspaceBrowser browser : ExtensionList.lookup(WorkspaceBrowser.class)) {
              FilePath f = browser.getWorkspace(this);
              if (f != null) return f;
          }
          return null;
      }