Fixed cargo manifest absolute path detection

Author: fafhrd91

CHANGES.rst

@@ -1,6 +1,12 @@
 CHANGES
 =======
 
+0.4.1 (2017-03-10)
+------------------
+
+- Fixed cargo manifest absolute path detection
+
+
 0.4 (2017-03-10)
 ----------------
 

setup.py

@@ -1,6 +1,6 @@
 from setuptools import setup
 
-version = '0.4'
+version = '0.4.1'
 
 
 setup(

setuptools_rust/__init__.py

@@ -61,10 +61,11 @@ def __init__(self, name, path,
         file = sys._getframe(1).f_globals.get('__file__')
         if file:
             dirname = os.path.dirname(file)
-            cwd = os.getcwd()
-            os.chdir(dirname)
-            path = os.path.abspath(path)
-            os.chdir(cwd)
+            if dirname:
+                cwd = os.getcwd()
+                os.chdir(dirname)
+                path = os.path.abspath(path)
+                os.chdir(cwd)
 
         self.path = path