Revert "disable license check for new formulae"

Library/Homebrew/dev-cmd/audit.rb

@@ -333,21 +333,23 @@ def audit_formula_name
     ].freeze
 
     def audit_license
-      return if formula.license.blank?
+      if formula.license.present?
+        if @spdx_data["licenses"].any? { |lic| lic["licenseId"] == formula.license }
+          return unless @online
 
-      if @spdx_data["licenses"].any? { |lic| lic["licenseId"] == formula.license }
-        return unless @online
+          user, repo = get_repo_data(%r{https?://github\.com/([^/]+)/([^/]+)/?.*}) if @new_formula
+          return if user.blank?
 
-        user, repo = get_repo_data(%r{https?://github\.com/([^/]+)/([^/]+)/?.*}) if @new_formula
-        return if user.blank?
+          github_license = GitHub.get_repo_license(user, repo)
+          return if github_license && (github_license == formula.license)
 
-        github_license = GitHub.get_repo_license(user, repo)
-        return if github_license && (github_license == formula.license)
-
-        problem "License mismatch - GitHub license is: #{github_license}, "\
-                "but Formulae license states: #{formula.license}."
-      else
-        problem "#{formula.license} is not a standard SPDX license."
+          problem "License mismatch - GitHub license is: #{github_license}, "\
+                  "but Formulae license states: #{formula.license}."
+        else
+          problem "#{formula.license} is not a standard SPDX license."
+        end
+      elsif @new_formula
+        problem "No license specified for package."
       end
     end
 

Library/Homebrew/test/dev-cmd/audit_spec.rb

@@ -99,6 +99,18 @@ class Foo < Formula
         expect(fa.problems).to be_empty
       end
 
+      it "detects no license info" do
+        fa = formula_auditor "foo", <<~RUBY, spdx_data: spdx_data, new_formula: true
+          class Foo < Formula
+            url "https://brew.sh/foo-1.0.tgz"
+            license ""
+          end
+        RUBY
+
+        fa.audit_license
+        expect(fa.problems.first).to match "No license specified for package."
+      end
+
       it "detects if license is not a standard spdx-id" do
         fa = formula_auditor "foo", <<~RUBY, spdx_data: spdx_data, new_formula: true
           class Foo < Formula