feat(standard): Add Logic.nilIfEmpty (#4221)

* feat(standard): Add `Logic.nilIfEmpty`

* testcases `Logic.nilIfEmpty`

* as per review

spec/logic_spec.lua

@@ -51,6 +51,19 @@ describe('logic', function()
 		end)
 	end)
 
+	describe('NilIfEmpty', function()
+		it('check', function()
+			assert.is_nil(Logic.nilIfEmpty({}))
+			assert.is_nil(Logic.nilIfEmpty())
+			assert.is_nil(Logic.nilIfEmpty(''))
+			assert.are_same({''}, Logic.nilIfEmpty({''}))
+			assert.are_same({'string'}, Logic.nilIfEmpty({'string'}))
+			assert.are_same({{}}, Logic.nilIfEmpty({{}}))
+			assert.are_same(1, Logic.nilIfEmpty(1))
+			assert.are_same('string', Logic.nilIfEmpty('string'))
+		end)
+	end)
+
 	describe('IsDeepEmpty', function()
 		it('check', function()
 			assert.is_true(Logic.isDeepEmpty({}))

standard/logic.lua

@@ -70,6 +70,13 @@ function Logic.isNotEmpty(val)
 	end
 end
 
+---@param val table|string?
+---@return table|string?
+function Logic.nilIfEmpty(val)
+	return Logic.isNotEmpty(val) and val or nil
+end
+
+
 ---Checks if a given object (table|string|nil) is deep empty
 ---i.e. is empty itself or only contains objects that are deep empty
 ---@param val table|string|nil