Cpp: Handle empty recipients consistently
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Cpp: Handle empty recipients consistently

* lang/cpp/src/context.cpp (Context::getKeysFromRecipients):
New helper.
(Context::encrypt, Context::startEncryption, Context::signAndEncrypt)
(Context::startCombinedSigningAndEncryption): Use new helper.
* lang/cpp/src/context.h (Context::getKeysFromRecipients): Add
as private helper.

bf776ce was incomplete as the code to handle recpients
was duplicated four times. This is now unified and constently
uses a nullptr instead of an empty array.