accomodate more point style

slider/external/neurolucida.py

@@ -199,8 +199,8 @@ def is_number(s):
 def is_point(p):
     '''Test if section looks like a point section'''
     result = True
-    if len(p) != 5: result = False
-    if not all([is_number(n) for n in p[:-1]]): result = False
+    if len(p) not in [4, 5]: result = False
+    if not all([is_number(n) for n in p[:4]]): result = False
     return result
 
 def parse_point(p):
@@ -265,7 +265,7 @@ def to_data(sections):
         else:
             contour.append(parse_contour(section))
 
-    cells = np.asarray(cells)
+    if len(cells)>0: cells = np.asarray(cells)
 
     return contour, cells