Fixing null reference exception

Author: Basyras

Source/Bogus.Tests/StrictModeTests.cs

@@ -1,4 +1,5 @@
 using System;
+using Bogus.Tests.Models;
 using FluentAssertions;
 using Xunit;
 
@@ -94,5 +95,15 @@ public void cannot_use_rules_with_strictmode_inside_rulesets()
          Action act2 = () => faker2.AssertConfigurationIsValid();
          act2.Should().Throw<ValidationException>();
       }
+
+      [Fact]
+      public void StrictMode_True_NoRules()
+      {
+         Assert.Throws<ValidationException>(() => 
+         {          
+            new Faker<Order>()
+               .StrictMode(true).Generate(1);
+         });
+      }
    }
 }

Source/Bogus/Faker[T].cs

@@ -744,7 +744,7 @@ private ValidationResult ValidateInternal(string[] ruleSets)
             {
                foreach( var propOrFieldOfT in userSet )
                {
-                  if( populateActions.TryGetValue(propOrFieldOfT, out var populateAction) )
+                  if( populateActions != null && populateActions.TryGetValue(propOrFieldOfT, out var populateAction) )
                   {
                      // Very much a .Rules() action
                      if( populateAction.ProhibitInStrictMode )