Add validation for BodyQuery result in Handle method

Previously, the `Handle` method in `BodyQueryBehavior<TRecAction>`
did not validate the `BodyQuery` result before setting `action.Body`.
This change introduces a check to ensure that the result and its
`RawBody` are not null. If either is null, an
`InvalidOperationException` is thrown with a clear error message.
This ensures `action.Body` is only set when a valid result is
retrieved, improving robustness and preventing potential null
reference issues.

src/ReC.Application/Common/Behaviors/BodyQueryBehavior.cs

@@ -12,9 +12,13 @@ public class BodyQueryBehavior<TRecAction>(IRecDbContext dbContext) : IPipelineB
     {
         if (action.BodyQuery is null)
             return await next(cancel);
-
+        
         var result = await dbContext.BodyQueryResults.FromSqlRaw(action.BodyQuery).FirstOrDefaultAsync(cancel);
-        action.Body = result?.RawBody;
+
+        if (result is null || result.RawBody is null)
+            throw new InvalidOperationException("Body query did not return a result or returned a null REQUEST_BODY.");
+
+        action.Body = result.RawBody;
 
         return await next(cancel);
     }