Temporary fix/workaround for bug #83. Checking for empty list before running cascaded_union.

camlib.py

@@ -1363,8 +1363,6 @@ class Gerber (Geometry):
                         else:
                             log.warning("Invalid arc in line %d." % line_num)
 
-
-
                 ### Operation code alone
                 # Operation code alone, usually just D03 (Flash)
                 # self.opcode_re = re.compile(r'^D0?([123])\*$')
@@ -1479,7 +1477,6 @@ class Gerber (Geometry):
                     print "RE:", self.lpol_re.pattern
                     print "MATCH:", self.lpol_re.search(gline)
 
-
                 match = self.lpol_re.search(gline)
                 if match:
                     if len(path) > 1 and current_polarity != match.group(1):
@@ -1493,6 +1490,9 @@ class Gerber (Geometry):
 
                     # --- Apply buffer ---
                     print "current_polarity:", current_polarity
+                    # If added for testing of bug #83
+                    # TODO: Remove when bug fixed
+                    if len(poly_buffer) > 0:
                         if current_polarity == 'D':
                             print "Union with Cascaded Union of:", poly_buffer
                             self.solid_geometry = self.solid_geometry.union(cascaded_union(poly_buffer))