Fix License.feature_available? when license table does not exist

app/models/license.rb

@@ -204,6 +204,8 @@ class License < ActiveRecord::Base
     end
 
     def load_license
+      return unless ActiveRecord::Base.connection.table_exists?(:licenses)
+
       license = self.last
 
       return unless license && license.valid?

spec/models/license_spec.rb

@@ -271,6 +271,17 @@ describe License do
     end
 
     describe ".current" do
+      context 'when licenses table does not exist' do
+        before do
+          allow(ActiveRecord::Base.connection).to receive(:table_exists?)
+            .with(:licenses).and_return(false)
+        end
+
+        it 'returns nil' do
+          expect(described_class.current).to be_nil
+        end
+      end
+
       context "when there is no license" do
         let!(:license) { nil }