RemoteLinux/Madde: Do not do too much checking in run control factories.

Only check whether we are generally responsible for the given type of
run configuration. Delay the other checks to a point where we can give a
meaningful error message to the user.

Task-number: QTCREATORBUG-6330
Change-Id: I9c8419da7780ebe17ff853bcae3de14b9cb66b71
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/remotelinux/remotelinuxdebugsupport.cpp

@@ -101,6 +101,7 @@ DebuggerStartParameters LinuxDeviceDebugSupport::startParameters(const RemoteLin
     Target *target = runConfig->target();
     Kit *k = target->kit();
     const IDevice::ConstPtr device = DeviceKitInformation::device(k);
+    QTC_ASSERT(device, return params);
 
     params.sysRoot = SysRootKitInformation::sysRoot(k).toString();
     params.debuggerCommand = DebuggerKitInformation::debuggerCommand(k).toString();