Completion of error handling about pika

[baotiao]

we think these functions are always run well. If we need to check every return value from the function, we will all many unusable code in it, it also makes the code unreadable.
so we just check the return values when we consider we need.

[elfring]

I suggest to avoid ignorance of return values a bit more. Would you like to detect every error situation as early as possible?

How do you think about to improve static source code analysis also for your software?