getWater() crashes app when HealthKit returns nil — should handle missing values safely

[Georg7]

Describe the bug
Calling AppleHealthKit.getWater() crashes the app on when HealthKit returns missing or undefined values (e.g. no water data). This happens in native code due to a nil value being inserted into an NSDictionary, which causes a fatal SIGABRT. The crash cannot be caught on the JS side, even with try/catch.

To Reproduce
Steps to reproduce the behavior:

1. Ensure there are no water intake entries for the current day in Apple Health
2. Call AppleHealthKit.getWater({ date: new Date() }, callback) from React Native
3. Observe native crash before callback is triggered

Expected behavior
The native module should handle missing data gracefully:

• Return null or a safe fallback in the response
• Or reject with an error via the callback. It should not crash the entire app.

Screenshots
N/A, but crash log excerpt:

*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[1]

Thread 14 Crashed:
4   0x204987ff0 __56-[RCTAppleHealthKit getWater:callback:]_block_invoke (RCTAppleHealthKit+Methods_Dietary.m:557)

Smartphone (please complete the following information):

• Device: iPhone 14
• OS: iOS 18.5 (22F76)
• Version: 1.18.0

Additional context
Looking at the native implementation of getWater, it appears sumQuantity or unit can be nil, and are inserted into an NSDictionary without nil checking.