don't crash on missing wsl distro flags - fixes #2744

terminus-terminal/src/shells/wsl.ts

@@ -88,7 +88,7 @@ export class WSLShellProvider extends ShellProvider {
             if (!childKey.DistributionName) {
                 continue
             }
-            const wslVersion = childKey.Flags.value & 8 ? 2 : 1
+            const wslVersion = (childKey.Flags?.value || 0) & 8 ? 2 : 1
             const name = childKey.DistributionName.value
             const fsBase = wslVersion === 2 ? `\\\\wsl$\\${name}` : childKey.BasePath.value as string + '\\rootfs'
             const slug = slugify(name, { remove: /[:.]/g })