Fix a few more potential crashes when attempting to load empty certificates

src/userconfigdlg.cpp

@@ -402,6 +402,10 @@ void UserConfigDialog::downloadPKICertificate() {
 			for (it = m_user.pkiCertificates.begin(); it != m_user.pkiCertificates.end(); ++it) {
 				PKICertificateEntry certificateData = *it;
 
+				// Don't attempt to load empty certificates
+				if (certificateData.second.size() < 1)
+					continue;
+
 				TQCString ssldata(certificateData.second);
 				ssldata[certificateData.second.size()] = 0;
 				ssldata.replace("-----BEGIN CERTIFICATE-----", "");
@@ -444,6 +448,10 @@ void UserConfigDialog::revokePKICertificate() {
 			for (it = m_user.pkiCertificates.begin(); it != m_user.pkiCertificates.end(); ++it) {
 				PKICertificateEntry certificateData = *it;
 
+				// Don't attempt to load empty certificates
+				if (certificateData.second.size() < 1)
+					continue;
+
 				TQCString ssldata(certificateData.second);
 				ssldata[certificateData.second.size()] = 0;
 				ssldata.replace("-----BEGIN CERTIFICATE-----", "");