Fix issue with setting python argv from julia ARGS

Author: jdlangs

src/RobotOS.jl

@@ -18,7 +18,9 @@ include("callbacks.jl")
 function __init__()
     #Put julia's ARGS into python's so remappings will work
     copy!(_py_sys, pyimport("sys"))
-    _py_sys."argv" = ARGS
+    if length(ARGS) > 0
+        _py_sys.argv = ARGS
+    end
 
     #Fill in empty PyObjects
     if ! (dirname(@__FILE__) in _py_sys."path")

test/rospy.jl

@@ -1,3 +1,5 @@
+import PyCall
+
 #Test basic rospy interactions
 init_node("jltest", anonymous=true)
 
@@ -32,3 +34,9 @@ RobotOS.get_node_uri()
 RobotOS.get_caller_id()
 RobotOS.get_published_topics()
 RobotOS.get_ros_root()
+
+#Issue 73 - Corruption of Python sys.argv
+PyCall.py"""
+import argparse
+argparse.ArgumentParser()
+"""