Fix pnpm compatibility

`@npmcli/arborist` (incorrectly?) returns dependencies with no package info when looking in `/node_modules/.pnpm` directory.

It does also return correct data from deeper nested dirs like for example `/node_modules/.pnpm/tmp@0.2.1/node_modules/tmp` so we can just ignore the invalid entries.

index.js

@@ -38,7 +38,7 @@ function licensee (configuration, path, callback) {
       .then(function (tree) {
         var dependencies = Array.from(tree.inventory.values())
           .filter(function (dependency) {
-            return !dependency.isProjectRoot
+            return !dependency.isProjectRoot && dependency.package.name
           })
         if (configuration.filterPackages) {
           dependencies = configuration.filterPackages(dependencies)

tests/pnpm-compatibility/.licensee.json

@@ -0,0 +1,10 @@
+{
+  "licenses": {
+    "spdx": [
+      "Apache-2.0"
+    ]
+  },
+  "packages": {
+    "mit-licensed": "1.0.0"
+  }
+}

tests/pnpm-compatibility/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "pnpm-workspace",
+  "dependencies": {
+    "mit-licensed": "^1.0.0"
+  },
+  "private": true
+}

tests/pnpm-compatibility/test.js

@@ -0,0 +1,5 @@
+var tap = require('tap')
+
+var results = require('../run')([], __dirname)
+
+tap.equal(results.status, 0)