HTTPCLIENT-1320: SSLSocketFactory#createSystemSSLContext causes UnrecoverableKeyException 'Password verification failed' when a truststore is specified with 'javax.net.ssl.trustStore' system property is used without a password
Contributed by Abe Backus <abraham at backus.com>

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/branches/4.2.x@1444407 13f79535-47bb-0310-9956-ffa450edef68