return when _devices is empty

[pvint]

Original report by Lucas Neumann (Bitbucket: fiakergulaschsaft, ).

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I’m using fauxmo in my project and I’m calling the handle() function no matter whether there are any devices registered in my project for alexa or not. instead I’m globally enabling/disabling alexa-support (fauxmo).

this might be a quite special case but I think it would be good to just return if the _devices vector is empty instead of doing pointless stuff in the code. in my case, the _devices vector was empty and the esp8266 gave me a exception(28) error everytime when alexa was searching for new devices.

i have to admit however, that I’m using a heavily modified version of your code where I have merged the belkin emulation into a current version of fauxmoesp (nasty stuff) because the hue emulation suddenly stopped working a while ago.

nonetheless, I think my fix might be beneficial anyways, even for your code because i think that it is just pointless to do stuff and waste cycles when there is nothing to do anyway.

all the best

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[pvint]

I think all of the places where this could be an issue have a check in them. Let me know if there's any lingering still....