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Fix iOS crash when a characteristic is read with no data #53
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When this._nativeCharacteristic.Value.Length is 0, ToArray will crash with the following error in iOS 8.4
System.ArgumentNullException: Argument cannot be null.
Parameter name: src
at at (wrapper managed-to-native) System.Runtime.InteropServices.Marshal:copy_from_unmanaged (intptr,int,System.Array,int)
at System.Runtime.InteropServices.Marshal.Copy (IntPtr source, System.Byte[] destination, Int32 startIndex, Int32 length) [0x00000] in /Users/builder/data/lanes/1503/e6ebd18b/source/mono/mcs/class/corlib/System.Runtime.InteropServices/Marshal.cs:146
at Foundation.NSData.ToArray () [0x00012] in /Users/builder/data/lanes/1503/e6ebd18b/source/maccore/src/Foundation/NSData.cs:50