fix(webpack): fixing null pointer about projectGraph with nx enhance configuration

[NicolasBelliard]

Hello!

I fixing issue related to nx project with enhanced webpack config.

I created this repository to reproduce the bug: https://github.com/NicolasBelliard/nx-enhance-example

Current Behavior

When created an Nx repository with nx enhanced config, we faced the current issue when we try to build the application.

> nx run nx-enhance:build

> webpack-cli build --node-env=production

[webpack-cli] TypeError: Cannot read properties of undefined (reading 'nodes')
    at calculateProjectDependencies (/home/test/dev/nx-enhance/node_modules/@nx/js/src/utils/buildable-libs-utils.js:24:30)
    at calculateProjectBuildableDependencies (/home/test/dev/nx-enhance/node_modules/@nx/js/src/utils/buildable-libs-utils.js:20:12)
    at NxTsconfigPathsWebpackPlugin.handleBuildLibsFromSource (/home/test/dev/nx-enhance/node_modules/@nx/webpack/src/plugins/nx-typescript-webpack-plugin/nx-tsconfig-paths-webpack-plugin.js:37:111)
    at NxTsconfigPathsWebpackPlugin.apply (/home/test/dev/nx-enhance/node_modules/@nx/webpack/src/plugins/nx-typescript-webpack-plugin/nx-tsconfig-paths-webpack-plugin.js:17:14)
    at createCompiler (/home/test/dev/nx-enhance/node_modules/webpack/lib/webpack.js:78:12)
    at create (/home/test/dev/nx-enhance/node_modules/webpack/lib/webpack.js:145:16)
    at webpack (/home/test/dev/nx-enhance/node_modules/webpack/lib/webpack.js:153:47)
    at WebpackCLI.f [as webpack] (/home/test/dev/nx-enhance/node_modules/webpack/lib/index.js:73:16)
    at WebpackCLI.createCompiler (/home/test/dev/nx-enhance/node_modules/webpack-cli/lib/webpack-cli.js:1785:29)
    at async WebpackCLI.runWebpack (/home/test/dev/nx-enhance/node_modules/webpack-cli/lib/webpack-cli.js:1877:20)
Warning: command "webpack-cli build --node-env=production" exited with non-zero status code


Process finished with exit code 1

Expected Behavior

No error and the build is working.

Related Issue(s)

#26303

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[ndcunningham]

LGTM, thanks!

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