The current assets.external implementation cannot handle empty lines.

Added a comment to warn about that.

chertex.sh

@@ -89,12 +89,13 @@ if [ $# -eq 1 ]; then
 	#### Special treatment for thesis
    if [[ ${PWD} ==  "/media/bay/taha/chepec/thesis" && $jobname == "thesis" ]]; then
       # Fetch external assets by reading any assets.external files in assets/ tree
+      # NOTE: be careful NOT to leave empty lines in your assets.external files
       echo "<thesis> -------------------------------"
       echo "<thesis> Getting external assets"
       echo "<thesis> -------------------------------"
-		# summary of operations in this if-clause:
+		  # summary of operations in this if-clause:
       # trawl the assets/ subdirectories looking for a file "external.assets", if found,
-      # read its contents line-by-line (each line is a path) and copy that file to the current assets/ subdir
+      # read its contents line-by-line (each line is a path) and copy that file at that path to the current assets/ subdir
       # note that we only look for assets.external inside the subdirectories, and not in assets/ itself
       assetsubdirectories="$(find /media/bay/taha/chepec/thesis/assets/ -maxdepth 1 -mindepth 1 -type d)"
       # loop through $assetdirs, and look for the file external.assets in each path