NetSSL Context throws on not implemented DH group

[SinghRajenM]

Describe the bug
In below code snippet, it seems the else (line 976) case is missing. Please confirm if it is bug, I can submit PR if required.

poco/NetSSL_OpenSSL/src/Context.cpp

Lines 963 to 978 in 4c2128c

	if (keyDHGroup == KEY_DH_GROUP_2048)
	{
	dh->p = BN_bin2bn(dh2048_p, sizeof(dh2048_p), 0);
	dh->g = BN_bin2bn(dh2048_g, sizeof(dh2048_g), 0);
	dh->length = 256;
	}
	else if (keyDHGroup == KEY_DH_GROUP_1024)
	{
	dh->p = BN_bin2bn(dh1024_p, sizeof(dh1024_p), 0);
	dh->g = BN_bin2bn(dh1024_g, sizeof(dh1024_g), 0);
	dh->length = 160;
	}
	{
	throw Poco::NotImplementedException(Poco::format(
	"DH Group: %d", static_cast<int>(keyDHGroup)));
	}