Fix some errors formatted text not being reported

Formatted blocks with empty contents were not being reported sometimes
when formatted text ended with them, e.g. "{$red$red}".

sources/Text/FormattedStrings/FormattingCommandsSequence.uc

@@ -244,8 +244,9 @@ private final function BuildSelf()
         currentContents[currentContents.length] = nextCharacter;
         characterCounter += 1;
     }
-    //  Only put in empty command if there is nothing else
-    if (currentContents.length > 0 || commandSequence.length == 0)
+    //  Only put in empty command if it is push command or there is nothing else
+    if (    currentCommand.type == FST_StackPush
+        ||  currentContents.length > 0 || commandSequence.length == 0)
     {
         currentCommand.contents = currentContents;
         commandSequence[commandSequence.length] = currentCommand;

sources/Text/Tests/TEST_FormattedStrings.uc

@@ -373,6 +373,7 @@ protected static function Test_Errors()
     SubTest_ErrorBadColor();
     SubTest_ErrorBadShortColorTag();
     SubTest_ErrorBadGradientPoint();
+    SubTest_ErrorBadGradientPointEmptyBlock();
     SubTest_AllErrors();
 }
 
@@ -511,6 +512,18 @@ protected static function SubTest_ErrorBadGradientPoint()
     TEST_ExpectTrue(errors[2].cause.ToString() == "3c");
 }
 
+protected static function SubTest_ErrorBadGradientPointEmptyBlock()
+{
+    local array<FormattingErrorsReport.FormattedStringError> errors;
+    Issue("Bad gradient point with empty text block is not reported.");
+    errors = class'FormattingStringParser'.static.ParseFormatted(
+        P("{$red$red}"),, true);
+    TEST_ExpectTrue(errors.length == 1);
+    TEST_ExpectTrue(errors[0].type == FSE_BadGradientPoint);
+    TEST_ExpectTrue(errors[0].cause.ToString() == "$red}");
+    TEST_ExpectTrue(errors[0].count == 0);
+}
+
 protected static function SubTest_AllErrors()
 {
     local int   i;