fix(core): fix decorate angular-cli script to work for production installs

Author: FrozenPandaz

packages/workspace/src/schematics/utils/decorate-angular-cli.js__tmpl__

@@ -25,7 +25,13 @@ const fs = require('fs');
 const os = require('os');
 const cp = require('child_process');
 const isWindows = os.platform() === 'win32';
-const { output } = require('@nrwl/workspace');
+let output;
+try {
+  output = require('@nrwl/workspace').output;
+} catch (e) {
+  console.warn('Angular CLI could not be decorated to enable computation caching. Please ensure @nrwl/workspace is installed.');
+  process.exit(0);
+}
 
 /**
  * Paths to files being patched