Fix: Text editor, blank lines were being indented

Summary: fixes T37613

Reviewers: campbellbarton, sergey

Reviewed By: sergey

Maniphest Tasks: T37613

Differential Revision: http://developer.blender.org/D42

source/blender/blenkernel/intern/text.c

@@ -2650,6 +2650,9 @@ void txt_indent(Text *text)
 
 	num = 0;
 	while (TRUE) {
+
+		/* don't indent blank lines */
+		if (text->curl->len != 0) {
 			tmp = MEM_mallocN(text->curl->len + indentlen + 1, "textline_string");
 
 			text->curc = 0;
@@ -2666,6 +2669,7 @@ void txt_indent(Text *text)
 
 			txt_make_dirty(text);
 			txt_clean_text(text);
+		}
 		
 		if (text->curl == text->sell) {
 			text->selc += indentlen;