Fix NullReferenceException in GetEnrollmentResult for null DCV email (#9)

* Fix NullReferenceException in GetEnrollmentResult for null DCV email

The condition for adding DCV email entries to the cnames dictionary was
inverted (string.IsNullOrEmpty instead of !string.IsNullOrEmpty), causing
cnames.Add(null, null) and an ArgumentNullException on every enrollment
where CSC returned a DcvDetail with email=null (typical for EMAIL DCV
orders that have actionNeeded=N, and for CNAME-only DCV).

Inverts the condition and adds a ContainsKey guard to mirror the existing
CName branch.

* Update generated docs

---------

Co-authored-by: Keyfactor <keyfactor@keyfactor.github.io>

Author: bhillkeyfactor

README.md

@@ -1,5 +1,5 @@
 <h1 align="center" style="border-bottom: none">
-    CSCGlobal CA  Gateway AnyCA Gateway REST Plugin
+    CSCGlobal CAPlugin AnyCA Gateway REST Plugin
 </h1>
 
 <p align="center">
@@ -38,10 +38,10 @@ This integration allows for the Synchronization, Enrollment, and Revocation of c
 
 ## Compatibility
 
-The CSCGlobal CA  Gateway AnyCA Gateway REST plugin is compatible with the Keyfactor AnyCA Gateway REST 24.2.0 and later.
+The CSCGlobal CAPlugin AnyCA Gateway REST plugin is compatible with the Keyfactor AnyCA Gateway REST 24.2.0 and later.
 
 ## Support
-The CSCGlobal CA  Gateway AnyCA Gateway REST plugin is supported by Keyfactor for Keyfactor customers. If you have a support issue, please open a support ticket with your Keyfactor representative. If you have a support issue, please open a support ticket via the Keyfactor Support Portal at https://support.keyfactor.com. 
+The CSCGlobal CAPlugin AnyCA Gateway REST plugin is supported by Keyfactor for Keyfactor customers. If you have a support issue, please open a support ticket with your Keyfactor representative. If you have a support issue, please open a support ticket via the Keyfactor Support Portal at https://support.keyfactor.com. 
 
 > To report a problem or suggest a new feature, use the **[Issues](../../issues)** tab. If you want to contribute actual bug fixes or proposed enhancements, use the **[Pull requests](../../pulls)** tab.
 
@@ -53,7 +53,7 @@ This integration is tested and confirmed as working for Anygateway REST 24.2 and
 
 1. Install the AnyCA Gateway REST per the [official Keyfactor documentation](https://software.keyfactor.com/Guides/AnyCAGatewayREST/Content/AnyCAGatewayREST/InstallIntroduction.htm).
 
-2. On the server hosting the AnyCA Gateway REST, download and unzip the latest [CSCGlobal CA  Gateway AnyCA Gateway REST plugin](https://github.com/Keyfactor/cscglobal-caplugin/releases/latest) from GitHub.
+2. On the server hosting the AnyCA Gateway REST, download and unzip the latest [CSCGlobal CAPlugin AnyCA Gateway REST plugin](https://github.com/Keyfactor/cscglobal-caplugin/releases/latest) from GitHub.
 
 3. Copy the unzipped directory (usually called `net6.0` or `net8.0`) to the Extensions directory:
 
@@ -64,11 +64,11 @@ This integration is tested and confirmed as working for Anygateway REST 24.2 and
     Program Files\Keyfactor\AnyCA Gateway\AnyGatewayREST\net8.0\Extensions
     ```
 
-    > The directory containing the CSCGlobal CA  Gateway AnyCA Gateway REST plugin DLLs (`net6.0` or `net8.0`) can be named anything, as long as it is unique within the `Extensions` directory.
+    > The directory containing the CSCGlobal CAPlugin AnyCA Gateway REST plugin DLLs (`net6.0` or `net8.0`) can be named anything, as long as it is unique within the `Extensions` directory.
 
 4. Restart the AnyCA Gateway REST service.
 
-5. Navigate to the AnyCA Gateway REST portal and verify that the Gateway recognizes the CSCGlobal CA  Gateway plugin by hovering over the ⓘ symbol to the right of the Gateway on the top left of the portal.
+5. Navigate to the AnyCA Gateway REST portal and verify that the Gateway recognizes the CSCGlobal CAPlugin plugin by hovering over the ⓘ symbol to the right of the Gateway on the top left of the portal.
 
 ## Configuration
 

cscglobal-caplugin/RequestManager.cs

@@ -80,7 +80,7 @@ public EnrollmentResult
                     cnames.Add(dcv.CName.Name, dcv.CName.Value);
                 }
 
-                if (string.IsNullOrEmpty(dcv.Email))
+                if (!string.IsNullOrEmpty(dcv.Email) && !cnames.ContainsKey(dcv.Email))
                 {
                     cnames.Add(dcv.Email, dcv.Email);
                 }