fix(utils): when imports list has no indentation

[micalevisk]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

What is the current behavior?

Issue Number: closes nestjs/nest-cli#1639

What is the new behavior?

now we can have a module declaration like the following:

@Module({
  imports: [
FooModule, // <<
  ],
})
export class AppModule {}

and nest g module bar will turn that into:

import { BarModule } from './bar/bar.module';

@Module({
  imports: [
FooModule,
BarModule, // <<
  ],
})
export class AppModule {}

Other examples

// FROM this:

@Module({
  imports: [
FooModule
  ],
})
export class AppModule {}

// TO this:

@Module({
  imports: [
FooModule,
BarModule
  ],
})
export class AppModule {}

// FROM this:

@Module({
  imports: [
 FooModule, // <<
  ],
})
export class AppModule {}

// TO this:

@Module({
  imports: [
 FooModule,
 BarModule, // <<
  ],
})
export class AppModule {}

// FROM this:

@Module({
  imports: [FooModule, // <<
  ],
})
export class AppModule {}

// TO this:

@Module({
  imports: [FooModule, BarModule, // <<
  ],
})
export class AppModule {}

Does this PR introduce a breaking change?

• Yes
• No

Other information

[kamilmysliwiec]

Great work @micalevisk!