Test version_error_handler with realistic data

Meilisearch::ApiError parses a server's JSON response into its
`@http_body` instance variable which stores a hash.
When `version_error_handler` propagates ApiError, it passes `@http_body`
as the server http body which causes ApiError to attempt to parse it
again as JSON, throwing a TypeError.

spec/meilisearch/utils_spec.rb

@@ -67,18 +67,33 @@
   end
 
   describe '.version_error_handler' do
+    let(:http_body) do
+      { 'message' => 'Was expecting an operation',
+        'code' => 'invalid_document_filter',
+        'type' => 'invalid_request',
+        'link' => 'https://docs.meilisearch.com/errors#invalid_document_filter' }
+    end
+
     it 'spawns same error message' do
       expect do
         described_class.version_error_handler(:my_method) do
-          raise MeiliSearch::ApiError.new(405, 'I came from Meili server', {})
+          raise MeiliSearch::ApiError.new(405, 'I came from Meili server', http_body)
+        end
+      end.to raise_error(MeiliSearch::ApiError, /I came from Meili server/)
+    end
+
+    it 'spawns same error message with no body' do
+      expect do
+        described_class.version_error_handler(:my_method) do
+          raise MeiliSearch::ApiError.new(405, 'I came from Meili server', nil)
         end
       end.to raise_error(MeiliSearch::ApiError, /I came from Meili server/)
     end
 
     it 'spawns message with version hint' do
       expect do
         described_class.version_error_handler(:my_method) do
-          raise MeiliSearch::ApiError.new(405, 'I came from Meili server', {})
+          raise MeiliSearch::ApiError.new(405, 'I came from Meili server', http_body)
         end
       end.to raise_error(MeiliSearch::ApiError, /that `my_method` call requires/)
     end