Add CalculateUpgrade::NULL

app/controllers/api/abstract_controller.rb

@@ -170,7 +170,7 @@ private
     def fbos_version
       when_farmbot_os do
         Gem::Version::new(pretty_ua.upcase.split("/").last.split(" ").first)
-      end || EXPECTED_VER.bump
+      end || CalculateUpgrade::NULL
     end
 
     # This is how we lock old versions of FBOS out of the API:

app/lib/calculate_upgrade.rb

@@ -1,9 +1,10 @@
 class CalculateUpgrade < Mutations::Command
+    NULL          = Gem::Version::new("0.0.0")
     MEDIUM_OLDISH = Gem::Version.new("5.0.9")
     LEGACY_CUTOFF = Gem::Version.new("5.0.6")
 
     # For extremely old versions:
-    OLD_OS_URL    = "https://api.github.com/repos/farmbot/farmbot_os"+
+    OLD_OS_URL    = "https://api.github.com/repos/farmbot/farmbot_os" +
                     "/releases/8772352"
 
     # For versions that are slightly out of date:
@@ -26,4 +27,4 @@ class CalculateUpgrade < Mutations::Command
     return MID_OS_URL if version <= MEDIUM_OLDISH
     return OS_RELEASE
   end
-end
+end

spec/lib/session_token_spec.rb

@@ -50,6 +50,7 @@ describe SessionToken do
     expect(test_case["5.0.8"]).to eq(CalculateUpgrade::MID_OS_URL)
     expect(test_case["5.0.9"]).to eq(CalculateUpgrade::MID_OS_URL)
     expect(test_case["6.0.1"]).to eq(CalculateUpgrade::OS_RELEASE)
+    expect(test_case["0.0.0"]).to eq(CalculateUpgrade::OLD_OS_URL)
   end
 
   it "doesn't honor expired tokens" do