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Appium 1.7.0 crashes Java client 5.0.3 when testing iOS

See original GitHub issue

Description

When attempting to use java-client 5.0.3 to test an iOS device with Appium 1.7.0, the java-client crashes with java.lang.NullPointerException: null value in entry: browserName=null

Environment

java client build version or git revision if you use some shapshot: 5.0.3
Appium server version or git revision if you use some shapshot: 1.7.0
Desktop OS/version used to run Appium if necessary: macOS Sierra 10.12.6
Node.js version (unless using Appium.app|exe) or Appium CLI or Appium.app|exe: Node.js v8.5.0, Appium 1.7.0
Mobile platform/version under test: iOS
Real device or emulator/simulator: Real Device

Details

Using the same Appium Server, I can use appium-desktop using the custom server option to connect to the iOS device just fine. Android is unaffected. I believe this chunk of the logs are could relevant:

2017-09-19 22:43:55:863 - info: [HTTP] <-- POST /wd/hub/session 200 23221 ms - 589 
2017-09-19 22:43:55:908 - info: [HTTP] --> GET /wd/hub/session/c4c0364a-9a80-442e-b328-3dbb5d77418b {}
2017-09-19 22:43:55:909 - info: [debug] [MJSONWP] Calling AppiumDriver.getSession() with args: ["c4c0364a-9a80-442e-b328-3dbb5d77418b"]
2017-09-19 22:43:55:909 - info: [debug] [XCUITest] Executing command 'getSession'
2017-09-19 22:43:55:924 - info: [debug] [JSONWP Proxy] Proxying [GET /] to [GET http://localhost:8100/session/25E38EC3-E56F-44E4-806E-9B404F0A9D80] with no body
2017-09-19 22:43:56:103 - info: [debug] [JSONWP Proxy] Got response with status 200: "{\n  \"value\" : {\n    \"sessionId\" : \"25E38EC3-E56F-44E4-806E-9B404F0A9D80\",\n    \"capabilities\" : {\n      \"device\" : \"iphone\",\n      \"browserName\" : null,\n      \"sdkVersion\" : \"10.3.2\",\n      \"CFBundleIdentifier\" : \"local.pid.53\"\n    }\n  },\n  \"sessionId\" : \"25E38EC3-E56F-44E4-806E-9B404F0A9D80\",\n  \"status\" : 0\n}"
2017-09-19 22:43:56:103 - info: [XCUITest] Merging WDA caps over Appium caps for session detail response
2017-09-19 22:43:56:104 - info: [debug] [MJSONWP] Responding to client with driver.getSession() result: {"udid":"67e44e99a952683ca27e8beccc50687bf4a71490","app":"/Users/nwelna/Documents/app-automation/appFiles/ios/app.ipa","xcodeOrgId":"UTURYJS693","automationName":"XCUITest","browserName":null,"platformName":"iOS","deviceName":"Test Device","xcodeSigningId":"iPhone Developer","usePrebuiltWDA":true,"device":"iphone","sdkVersion":"10.3.2","CFBundleIdentifier":"local.pid.53"}
2017-09-19 22:43:56:105 - info: [HTTP] <-- GET /wd/hub/session/c4c0364a-9a80-442e-b328-3dbb5d77418b 200 196 ms - 486 
2017-09-19 22:43:56:196 - info: [Appium] Received SIGTERM - shutting down