Crash if info.version is not a string

[lafrech]

I just experienced a crash.

ReDoc "frozen" displaying "Loading".

Debug console says

EXCEPTION: this.info.version.substring is not a function

I guess it happens here:

  init() {
    this.info = this.componentSchema.info;
    this.specUrl = this.optionsService.options.specUrl;
    if (!isNaN(parseInt(this.info.version.substring(0, 1)))) {
      this.info.version = 'v' + this.info.version;
    }
  }

My fault. Broken spec file. Version was not a string but an int.

Anyway, I suppose ReDoc would rather not crash but report a spec file issue.