Will it be handy if i run out of paint and have no time to reload my hopper ?
No. If you can draw a pistol then you can reload.
Technically you can draw and shoot a pistol in 2 steps, to reload you need to draw the pod, flick the lid, flick your hopper lid (or use a speed feed) pour and shoot. You can draw and flick open in one step, and pour in another - so it can be 2 steps again
Put practice into pointing your gun and loading a hopper at the same time and you can shoot and reload
Not to put a downer on pistol ownership, as I am a pistol lover
Pistol play is fun. Up against normal players you are at a disadvantage
You can have very small setups with a full hopper and air system to do the 'compact' job of a pistol
As an emergency sidearm paintball pistols are a waste of your money
Learn to maintain & resolve problems with your main
On the empty hopper situation take it as a lesson learnt if you experience it and ensure you don't run empty before reloading