Added hack so that users are not forced to have LD_LIBRARY_PATH set. refs #3614

Code/Mantid/Framework/PythonInterface/mantid/kernel/dlopen.py

@@ -25,7 +25,11 @@ else:
     else: # Give it a go how it is
         _var = ''
         _sep = ''
-_oldpath = os.environ[_var]
+try:
+    _oldpath = os.environ[_var]
+except:
+    _oldpath = ''
+    _sep = ''
 os.environ[_var] = os.environ['MANTIDPATH'] + _sep + _oldpath       
 
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