cosmetic changes

@@ -448,7 +448,6 @@ precedence = (
 
 class ParseError(Exception):
     "Exception raised whenever a parsing error occurs."
-
     pass
 
 def p_translation_unit_01(t):

@@ -178,14 +178,21 @@ class CodeGenVisitor (Visitor) :
                       "# Franck Pommereau (2018)\n"
                       "# Adapted from Atul Varma's c.py (Spring 2004)\n")
         for c in chunks :
-            outfile.write("\n# code from file %r\n" % c.path)
-            outfile.write(c.curr_str.getvalue())
+            s = c.curr_str.getvalue()
+            if s.strip() :
+                outfile.write("\n###\n### code from file %r\n###\n" % c.path)
+                outfile.write(s)
         for c in chunks :
-            outfile.write("\n# globals from file %r\n\n" % c.path)
-            outfile.write(c.globals_str.getvalue())
+            s = c.globals_str.getvalue()
+            if s.strip() :
+                outfile.write("\n###\n### globals from file %r\n###\n\n" % c.path)
+                outfile.write(s)
         for c in chunks :
-            outfile.write("\n# string literals from file %r\n\n" % c.path)
-            outfile.write(c.str_literal_str.getvalue())
+            s = c.str_literal_str.getvalue()
+            if s.strip() :
+                outfile.write("\n###\n### string literals from file %r\n###\n\n"
+                              % c.path)
+                outfile.write(s)
 
     def _calc_function_var_addrs(self, symtab, last_fp_loc):
         self._calc_function_arg_addrs(symtab)