Fix a few Rubocop errors added in the latest version of Rubocop (0.48)

The errors were being triggered by the following new cops:

- rubocop/rubocop#4133
- rubocop/rubocop#3889
- rubocop/rubocop#4028

ablecop.gemspec

@@ -1,4 +1,5 @@
 # coding: utf-8
+
 $LOAD_PATH.push File.expand_path("../lib", __FILE__)
 require "ablecop/version"
 
@@ -15,25 +16,24 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.post_install_message = <<-MSG
-Ablecop Setup - Local
-===========================================================================
-You can generate the necessary configuration files to run any code
-analysis locally by running the following command:
-
-    bundle exec rails g ablecop:install
-
-Ablecop Setup - CircleCI
-===========================================================================
-To enable CircleCI to run ablecop's checks and comment on commits with each
-push, add the following configuration to your circle.yml configuration:
-
-test:
-  pre:
-    - bundle exec rails g ablecop:install
-  post:
-    - RAILS_ENV=development bundle exec rake ablecop:run_on_circleci
-
-MSG
+    Ablecop Setup - Local
+    ===========================================================================
+    You can generate the necessary configuration files to run any code
+    analysis locally by running the following command:
+
+        bundle exec rails g ablecop:install
+
+    Ablecop Setup - CircleCI
+    ===========================================================================
+    To enable CircleCI to run ablecop's checks and comment on commits with each
+    push, add the following configuration to your circle.yml configuration:
+
+    test:
+      pre:
+        - bundle exec rails g ablecop:install
+      post:
+        - RAILS_ENV=development bundle exec rake ablecop:run_on_circleci
+  MSG
 
   spec.required_ruby_version = ">= 2.2.0"
 

lib/ablecop/tasks/ablecop.rake

@@ -5,15 +5,15 @@ desc "Runs ablecop automatted code review on CircleCI"
 namespace :ablecop do
   desc "Run code analysis for the current commit / pull request on CircleCI"
   task :run_on_circleci do
-    abort("The GitHub access token is missing. Please set the PRONTO_GITHUB_ACCESS_TOKEN environment variable as specified in the README: https://github.com/ableco/ablecop#circleci--github-setup") unless ENV["PRONTO_GITHUB_ACCESS_TOKEN"].present?
+    abort("The GitHub access token is missing. Please set the PRONTO_GITHUB_ACCESS_TOKEN environment variable as specified in the README: https://github.com/ableco/ablecop#circleci--github-setup") if ENV["PRONTO_GITHUB_ACCESS_TOKEN"].blank?
 
     require_pronto_runners
 
     # If CircleCI includes the pull request information, run the code analysis on the
     # branch for the pull request.
     if ENV["CI_PULL_REQUEST"].present?
       ENV["PULL_REQUEST_ID"] = ENV["CI_PULL_REQUEST"].match("[0-9]+$").to_s
-      abort("Pull Request ID is missing") unless ENV["PULL_REQUEST_ID"].present?
+      abort("Pull Request ID is missing") if ENV["PULL_REQUEST_ID"].blank?
 
       pull_request_formatter = Pronto::Formatter::GithubPullRequestFormatter.new
       status_formatter = Pronto::Formatter::GithubStatusFormatter.new