Merge Info.plist fails second build

[dtopuzov]

I have Info.plist located in platform folder of the plugin:
SimpleBackgroundHttp/node_modules/nativescript-background-http/platforms/ios/Info.plist

Content of Info.plist is:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>NSAppTransportSecurity</key>
    <dict>
        <key>NSAllowsArbitraryLoads</key>
        <true/>
    </dict>
</dict>
</plist>

When build iOS for first time everything is ok, but when build second time final plist looks like this:

    <key>NSAppTransportSecurity</key>
    <dict>
      <key>NSAllowsArbitraryLoads</key>
      <true/>
      <key>NSAllowsArbitraryLoads</key>
      <true/>
      <key>NSAllowsArbitraryLoads</key>
      <true/>
      <key>NSAllowsArbitraryLoads</key>
      <true/>
    </dict>
    <key>NSAppTransportSecurity</key>
    <key>NSAppTransportSecurity</key>
    <key>NSAppTransportSecurity</key>

It can be reproduced with nativescript-background-http with following steps:

1. Clone the repo
2. Install prerequisites
3. Run "grunt tests --os-version 9.0 --device "iPhone 6 90" --verbose" twice

Result is:

>> ** BUILD FAILED **
>> 
>> 
>> The following build commands failed:
>> ProcessInfoPlistFile build/emulator/SimpleBackgroundHttp.app/Info.plist SimpleBackgroundHttp/SimpleBackgroundHttp-Info.plist
>> (1 failure)
>> Command xcodebuild failed with exit code 65

[Fatme]

The problem happens only when the source code of the plugin that contains Info.plist file is modified.