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This patch should be enough to understand the issue

 if SETTINGS[:ssl_ca] && !SETTINGS[:ssl_ca].empty?
       http.ca_file = SETTINGS[:ssl_ca]
       http.verify_mode = OpenSSL::SSL::VERIFY_PEER
     else
       http.verify_mode = OpenSSL::SSL::VERIFY_NONE
     end
-    if SETTINGS[:ssl_cert] and SETTINGS[:ssl_key]
+    if SETTINGS[:ssl_cert] && !SETTINGS[:ssl_cert].empty? && SETTINGS[:ssl_key] && !SETTINGS[:ssl_key].empty?
       http.cert = OpenSSL::X509::Certificate.new(File.read(SETTINGS[:ssl_cert]))
       http.key  = OpenSSL::PKey::RSA.new(File.read(SETTINGS[:ssl_key]), nil)
     end