Add default for valid qlim, Fix #276

Author: jhavl

roboticstoolbox/robot/ERobot.py

@@ -264,6 +264,7 @@ def visit_link(link, jindex):
                 j += 1
         self._qlim = qlim
 
+        self._valid_qlim = False
         for i in range(self.n):
             if any(qlim[:, i] != 0) and not any(isnan(qlim[:, i])):
                 self._valid_qlim = True
@@ -1311,7 +1312,7 @@ def URDF(cls, file_path, gripper=None):
                 raise TypeError("bad argument passed as gripper")
 
         links, name, urdf_string, urdf_filepath = ERobot.URDF_read(file_path)
-
+        print(cls)
         return cls(
             links,
             name=name,