* morituri/common/common.py:

Add MissingDependencyException.
	* morituri/program/cdrdao.py:
	* morituri/rip/main.py:
	  Use it to warn about missing cdrdao.

morituri/common/common.py

@@ -205,3 +205,10 @@ def tagListEquals(tl1, tl2):
     d2 = tagListToDict(tl2)    
 
     return d1 == d2
+
+class MissingDependencyException(Exception):
+    dependency = None
+
+    def __init__(self, *args):
+        self.args = args
+        self.dependency = args[0]