warn exceptions friendly

[chinesedfan]

Due to the npm bug, wrong version of glob may be installed. For example, if add glob 7 in devDependencies, it will cause ENOTDIR invalid cwd error.

It's better to warn exceptions friendly in following codes. Or users will be confused for some error like TypeError: Invalid Version: undefined.

  var modulePath, modulePackage;
  try {
    var delim = (process.platform === 'win32' ? ';' : ':'),
        paths = (process.env.NODE_PATH ? process.env.NODE_PATH.split(delim) : []);
    modulePath = resolve.sync(this.moduleName, {basedir: configBase || cwd, paths: paths});
    modulePackage = silentRequire(fileSearch('package.json', [modulePath]));
  } catch (e) {}