version: allow versions to be compared against NULL_TOKEN

Library/Homebrew/test/version_spec.rb

@@ -184,9 +184,14 @@ describe Version do
   end
 
   it "can be compared against tokens" do
+    expect(described_class.create("2.1.0-p194")).to be > Version::Token.create("2")
     expect(described_class.create("1")).to be == Version::Token.create("1")
   end
 
+  it "can be compared against Version::NULL_TOKEN" do
+    expect(described_class.create("2.1.0-p194")).to be > Version::NULL_TOKEN
+  end
+
   specify "comparison returns nil for non-version" do
     v = described_class.create("1.0")
     expect(v <=> Object.new).to be nil

Library/Homebrew/version.rb

@@ -445,9 +445,9 @@ class Version
     # Used by the *_build_version comparisons, which formerly returned Fixnum
     other = Version.new(other.to_s) if other.is_a? Integer
     return 1 if other.nil?
+    return 1 if other.respond_to?(:null?) && other.null?
 
     other = Version.new(other.to_s) if other.is_a? Token
-    return 1 if other.respond_to?(:null?) && other.null?
     return unless other.is_a?(Version)
     return 0 if version == other.version
     return 1 if head? && !other.head?