Don't generate empty scripts = [] in generated build files

internal/npm_install/generate_build_file.js

@@ -697,9 +697,16 @@ function printPackage(pkg) {
   // TODO(gmagolan): add UMD & AMD scripts to scripts even if not an APF package _but_ only if they
   // are named?
   const scripts = getNgApfScripts(pkg);
-
   const pkgDeps = pkg._dependencies.filter(dep => dep !== pkg && !dep._isNested);
 
+  let scriptStarlark = '';
+  if (scripts.length) {
+    scriptStarlark = `
+    scripts = [
+        ${scripts.map(f => `":${f}",`).join('\n        ')}
+    ],`;
+  }
+
   let result = `load("@build_bazel_rules_nodejs//:defs.bzl", "nodejs_binary")
 load("@build_bazel_rules_nodejs//internal/npm_install:node_module_library.bzl", "node_module_library")
 
@@ -725,10 +732,7 @@ node_module_library(
     name = "${pkg._name}__files",
     srcs = [
         ${sources.map(f => `":${f}",`).join('\n        ')}
-    ],
-    scripts = [
-        ${scripts.map(f => `":${f}",`).join('\n        ')}
-    ],
+    ],${scriptStarlark}
 )
 
 node_module_library(