Revert "Address issue #23"

This reverts commit 71422bd.

morituri/rip/cd.py

@@ -168,9 +168,11 @@ def do(self, args):
                 self.program.result.release = \
                 cdio.Device(self.device).get_hwinfo()
         except ImportError:
-            raise ImportError("Pycdio module import failed.\n"
-                              "This is a hard dependency: if not available "
-                              "please install it")
+            self.stdout.write(
+                'WARNING: pycdio not installed, cannot identify drive\n')
+            self.program.result.vendor = 'Unknown'
+            self.program.result.model = 'Unknown'
+            self.program.result.release = 'Unknown'
 
         self.doCommand()
 
@@ -271,13 +273,11 @@ def handleOptions(self, options):
                     pass
 
         if options.offset is None:
-            raise ValueError("Drive offset is unconfigured.\n"
-                             "Please install pycdio and run 'rip offset "
-                             "find' to detect your drive's offset or set it "
-                             "manually in the configuration file. It can "
-                             "also be specified at runtime using the "
-                             "'--offset=value' argument")
-
+            options.offset = 0
+            self.stdout.write("""WARNING: using default offset %d.
+Install pycdio and run 'rip offset find' to detect your drive's offset.
+""" %
+                        options.offset)
         if self.options.output_directory is None:
             self.options.output_directory = os.getcwd()
         else: