Don't raise when converting the tag to a version fails

Library/Homebrew/bottles.rb

@@ -114,10 +114,16 @@ class BottleCollector
   # so the same bottle can target multiple OSs.
   # Not used in core, used in taps.
   def find_or_later_tag(tag)
+    begin
+      tag_version = MacOS::Version.from_symbol(tag)
+    rescue ArgumentError
+      return
+    end
+
     keys.find do |key|
       if key.to_s.end_with?("_or_later")
         later_tag = key.to_s[/(\w+)_or_later$/, 1].to_sym
-        MacOS::Version.from_symbol(later_tag) <= MacOS::Version.from_symbol(tag)
+        MacOS::Version.from_symbol(later_tag) <= tag_version
       end
     end
   end

Library/Homebrew/test/test_bottle_collector.rb

@@ -20,6 +20,16 @@ class BottleCollectorTests < Homebrew::TestCase
     assert_nil checksum_for(:foo)
   end
 
+  def test_collector_returns_nil_for_no_match
+    @collector[:lion] = "foo"
+    assert_nil checksum_for(:foo)
+  end
+
+  def test_collector_returns_nil_for_no_match_when_later_tag_present
+    @collector[:lion_or_later] = "foo"
+    assert_nil checksum_for(:foo)
+  end
+
   def test_collector_finds_or_later_tags
     @collector[:lion_or_later] = "foo"
     assert_equal ['foo', :lion_or_later], checksum_for(:mountain_lion)