The number of CacheDev policy arguments could be incorrect

[waltdisgrace]

Related: #485

Currently, the program can fail at runtime, since user-inputted policy arguments which are incorrect can lead to a out-of-bounds error.

Such arguments could be incorrect in one or both of the following ways:

• The argument which specifies the number of policy arguments that are supposedly inputted could be different than the number of policy arguments that are actually inputted.
• The argument which specifies the number of policy arguments could be odd, i.e. unrepresentative of complete key/value pairs to be passed to the policy.