Fix indentation problems in macro editor preventing it to create new multi-line macros

pronterface.py

@@ -1235,6 +1235,8 @@ class macroed(wx.Dialog):
     def unindent(self,text):
         import re
         self.indent_chars = text[:len(text)-len(text.lstrip())]
+        if len(self.indent_chars)==0:
+            self.indent_chars="  "
         unindented = ""
         lines = re.split(r"(?:\r\n?|\n)",text)
         #print lines
@@ -1253,6 +1255,7 @@ class macroed(wx.Dialog):
             return text
         reindented = ""
         for line in lines:
+            if line.strip() != "":
                 reindented += self.indent_chars + line + "\n"
         return reindented