fix: remove implicit if-present logic from run-script workspaces

BREAKING CHANGE: npm no longer treats missing scripts as a special case
in workspace mode.  Use `if-present` to ignore missing scripts.

lib/commands/run-script.js

@@ -207,24 +207,10 @@ class RunScript extends BaseCommand {
         log.error(err)
         log.error(`  in workspace: ${pkg._id || pkg.name}`)
         log.error(`  at location: ${workspacePath}`)
-
-        const scriptMissing = err.message.startsWith('Missing script')
-
-        // avoids exiting with error code in case there's scripts missing
-        // in some workspaces since other scripts might have succeeded
-        if (!scriptMissing) {
-          process.exitCode = 1
-        }
-
-        return scriptMissing
+        process.exitCode = 1
       })
       res.push(runResult)
     }
-
-    // in case **all** tests are missing, then it should exit with error code
-    if (res.every(Boolean)) {
-      throw new Error(`Missing script: ${args[0]}`)
-    }
   }
 
   async listWorkspaces (args, filters) {

test/lib/commands/run-script.js

@@ -781,12 +781,7 @@ t.test('workspaces', async t => {
   t.test('missing scripts in all workspaces', async t => {
     const { runScript, RUN_SCRIPTS, cleanLogs } = await mockWorkspaces(t, { exec: null })
 
-    await t.rejects(
-      runScript.exec(['missing-script']),
-      /Missing script: missing-script/,
-      'should throw missing script error'
-    )
-
+    await runScript.exec(['missing-script'])
     t.match(RUN_SCRIPTS(), [])
     t.strictSame(
       cleanLogs(),