I am encountering a similear problem, but with a nearly empty example project I just created. Built upon the 'Master Detail' app template w/ Unit & UI tests.
I created a bot, it runs and the two auto generated tests both pass. I can view and select around all Integration tabs except for Coverage. The moment I select that tab Xcode crashes. See backtrace below.
Xcode 7.1.1
==
Application Specific Information:
ProductBuildVersion: 7B1005
UNCAUGHT EXCEPTION (NSInvalidArgumentException): *** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[0]
UserInfo: (null)
Hints: None
Backtrace:
0 0x00007fffa0247e1a __exceptionPreprocess (in CoreFoundation)
1 0x000000010af1ac6e DVTFailureHintExceptionPreprocessor (in DVTFoundation)
2 0x00007fff8f0644fa objc_exception_throw (in libobjc.A.dylib)
3 0x00007fffa0139e92 -[__NSPlaceholderArray initWithObjects:count:] (in CoreFoundation)
4 0x00007fffa0142bf4 +[NSArray arrayWithObjects:count:] (in CoreFoundation)
5 0x000000011e2fca2a -[XCSUIIntegrationCoverageViewController fetchCoverageIntegration:completionBlock:] (in XCSUI)
6 0x000000011e2fc1e4 __57-[XCSUIIntegrationCoverageViewController setIntegration:]_block_invoke (in XCSUI)
7 0x000000011e1ec3ec __96-[XCSService(CodeCoverageAdditions) codeCoverageIntegrationWithIntegrationID:completionHandler:]_block_invoke (in XCSCore)
8 0x000000011e18ffbe __57-[XCSService _findObjectsOfClass:base:completionHandler:]_block_invoke (in XCSCore)
9 0x000000011e19d19b __54-[XCSHTTPRequest performRequestWithCompletionHandler:]_block_invoke_3 (in XCSCore)
10 0x000000011e1e98dc __97-[XCSService(ErrorHandlingAdditions) handleError:forRequest:withFallThroughHandler:retryHandler:]_block_invoke_2 (in XCSCore)
11 0x000000011e2d51b6 -[XCSService(XCSUIAdditions) service:didEncounterError:withRequest:proceed:] (in XCSUI)
12 0x000000011e1e9875 __97-[XCSService(ErrorHandlingAdditions) handleError:forRequest:withFallThroughHandler:retryHandler:]_block_invoke (in XCSCore)
13 0x00007fff950858f5 _dispatch_call_block_and_release (in libdispatch.dylib)
14 0x00007fff9507a3c3 _dispatch_client_callout (in libdispatch.dylib)
15 0x00007fff9508dc1b _dispatch_main_queue_callback_4CF (in libdispatch.dylib)
16 0x00007fffa01fd999 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ (in CoreFoundation)
17 0x00007fffa01bc9cd __CFRunLoopRun (in CoreFoundation)
18 0x00007fffa01bbfc8 CFRunLoopRunSpecific (in CoreFoundation)
19 0x00007fff99fa4d55 RunCurrentEventLoopInMode (in HIToolbox)
20 0x00007fff99fa4b8f ReceiveNextEventCommon (in HIToolbox)
21 0x00007fff99fa49cf _BlockUntilNextEventMatchingListInModeWithFilter (in HIToolbox)
22 0x00007fff9ca81d96 _DPSNextEvent (in AppKit)
23 0x00007fff9ca811c5 -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] (in AppKit)
24 0x000000010b4ee5f4 -[DVTApplication nextEventMatchingMask:untilDate:inMode:dequeue:] (in DVTKit)
25 0x00007fff9ca75d28 -[NSApplication run] (in AppKit)
26 0x00007fff9ca3efbe NSApplicationMain (in AppKit)
27 0x00007fff94f5a5ad start (in libdyld.dylib)