add proper deno.exit even if no errors found.

Author: rwblair

src/bids-validator.ts

@@ -6,3 +6,4 @@ const errors = result.issues.get({ severity: 'error' })
 if (errors.length) {
   Deno.exit(16)
 }
+Deno.exit(0)

src/validators/bids.ts

@@ -112,6 +112,7 @@ export async function validate(
     }
     await summary.update(context)
   }
+
   for (const check of perDSChecks) {
     await check(schema as unknown as GenericSchema, dsContext)
   }