message: Make environmentType optional
diff: @@ -107,7 +107,7 @@ const typeDefs = `
  siteGroupByName(name: String!): SiteGroup
  siteGroupByGitUrl(gitUrl: String!): SiteGroup
  allSiteGroups(createdAfter: String, gitUrl: String): [SiteGroup]
  - allSites(environmentType: String!): [Site]
  + allSites(environmentType: String): [Site]
  siteByName(name: String!): Site
  allClients: [Client]
  }
  