From 09fb60f2541d2b9ebf3c6d7651325ee6dfc12b1c Mon Sep 17 00:00:00 2001
From: "Eugeniy E. Mikhailov" <evgmik@gmail.com>
Date: Mon, 28 May 2018 21:49:23 -0400
Subject: do not show histogram marker if nessesary stats are not available

---
 GradeBook_lib.tcl | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

(limited to 'GradeBook_lib.tcl')

diff --git a/GradeBook_lib.tcl b/GradeBook_lib.tcl
index 11280ee..17e8f6b 100755
--- a/GradeBook_lib.tcl
+++ b/GradeBook_lib.tcl
@@ -1405,11 +1405,16 @@ proc htmlFormatColVal { col_value columnname user user_shown permission_list {fo
 		UserHiddenGradeCategories \
 		]
 	
-	# adding histogram marker
 	if { ([SelectColValue4User GroupName $user_shown] ne "inforow") && ($user ni $special_user_names) && ($columnname ni $embeded_actions_excluded_special_columns) } {
+		# adding histogram marker
+		set hist_marker ""
 		set col_histogram_limits [SelectColValue4User $columnname _The_Grades_Hist_Limits_]
-		set histPositionMarker [markNthBin [binInHistogram $col_value_raw $col_histogram_limits]]
-		set col_str_value "<span class=histogram_marker>$histPositionMarker<br></span><span class=grade>$col_str_value</span>"
+		if { $col_histogram_limits ne "" } {
+			set histPositionMarker [markNthBin [binInHistogram $col_value_raw $col_histogram_limits]]
+			append hist_marker "<span class=histogram_marker>$histPositionMarker</span><br>"
+		}
+		# adding special span for grade itself
+		set col_str_value "$hist_marker<span class=grade>$col_str_value</span>"
 	}
 
 	if { ([SelectColValue4User GroupName $user_shown] ne "inforow") && ($user ni $special_user_names) && ($category ne "weighted_column") && ($columnname ni $embeded_actions_excluded_special_columns) } {
-- 
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