[CXF-5199] - Using an EncryptBeforeSigning policy with no EncryptedParts/Elements results in no Signature in the request


Conflicts:
	rt/ws/security/src/main/java/org/apache/cxf/ws/security/wss4j/policyhandlers/AsymmetricBindingHandler.java
	systests/ws-security/src/test/java/org/apache/cxf/systest/ws/x509/X509TokenTest.java
	systests/ws-security/src/test/resources/org/apache/cxf/systest/ws/x509/DoubleItX509.wsdl
	systests/ws-security/src/test/resources/org/apache/cxf/systest/ws/x509/client/client.xml
	systests/ws-security/src/test/resources/org/apache/cxf/systest/ws/x509/server/server.xml

git-svn-id: https://svn.apache.org/repos/asf/cxf/branches/2.7.x-fixes@1513511 13f79535-47bb-0310-9956-ffa450edef68