matlab < R2020b compatible

Author: scivision

+stdlib/+fileio/path_tail.m

@@ -8,6 +8,11 @@
 
 import stdlib.fileio.absolute_path
 
+if isempty(apath)
+  last = string.empty;
+  return
+end
+
 if strlength(apath) == 0
   last = "";
   return

+stdlib/+fileio/with_suffix.m

@@ -11,6 +11,10 @@
   suffix (1,1) string
 end
 
+if isempty(filename)
+  return
+end
+
 [direc, name, ext] = fileparts(filename);
 if ext ~= suffix
   filename = fullfile(direc, name + suffix);