Add method overload for getIdFieldValues to omit null values

sfdx-source/apex-extensions/main/default/classes/domains/fflib_SObjects2.cls

@@ -657,6 +657,26 @@ public virtual class fflib_SObjects2
 		return result;
 	}
 
+	/**
+	 * Gets the Id values, but with the option to omit null values
+	 *
+	 * @param field The Schema.SObjectField to get their Id values
+	 * @param omitNulls If set to TRUE, null values will be removed from the result
+	 *
+	 * @return The Id values of the given sObjectField, null values are omitted
+	 */
+	@TestVisible
+	protected Set<Id> getIdFieldValues(Schema.SObjectField field, Boolean omitNulls)
+	{
+		Set<Id> result = getIdFieldValues(field);
+
+		if (omitNulls)
+		{
+			result.remove(null);
+		}
+		return result;
+	}
+
 	/**
 	 * @param sObjectField The Schema.SObjectField to get their Id values
 	 * @param criteria The criteria condition that must be met to include the value in the return
@@ -791,11 +811,13 @@ public virtual class fflib_SObjects2
 		return result;
 	}
 
+	@TestVisible
 	protected virtual List<SObject> getRecordsIsNot(Schema.SObjectField sObjectField, Id idValue)
 	{
 		return getRecordsNotIn(sObjectField, new Set<Id>{ idValue });
 	}
 
+	@TestVisible
 	protected virtual List<SObject> getRecordsNotIn(Schema.SObjectField sObjectField, Set<Id> idValues)
 	{
 		List<SObject> result = new List<SObject>();