mutex helper printf support and nullptr check

ipc/MutexHelper.h

@@ -2,33 +2,44 @@
 #define FRAMEWORK_IPC_MUTEXHELPER_H_
 
 #include "MutexFactory.h"
-#include "../serviceinterface/ServiceInterfaceStream.h"
+#include "../serviceinterface/ServiceInterface.h"
 
 class MutexHelper {
 public:
     MutexHelper(MutexIF* mutex, MutexIF::TimeoutType timeoutType =
             MutexIF::TimeoutType::BLOCKING, uint32_t timeoutMs = 0):
             internalMutex(mutex) {
+        if(mutex == nullptr) {
+            return;
+        }
         ReturnValue_t status = mutex->lockMutex(timeoutType,
                 timeoutMs);
         if(status == MutexIF::MUTEX_TIMEOUT) {
 #if FSFW_CPP_OSTREAM_ENABLED == 1
             sif::error << "MutexHelper: Lock of mutex failed with timeout of "
                     << timeoutMs << " milliseconds!" << std::endl;
+#else
+            sif::printError("MutexHelper: Lock of mutex failed with timeout of %lu milliseconds\n",
+                    timeoutMs);
 #endif
         }
         else if(status != HasReturnvaluesIF::RETURN_OK){
 #if FSFW_CPP_OSTREAM_ENABLED == 1
             sif::error << "MutexHelper: Lock of Mutex failed with code "
                     << status << std::endl;
+#else
+            sif::printError("MutexHelper: Lock of Mutex failed with code %d\n", status);
 #endif
         }
     }
 
     ~MutexHelper() {
+        if(internalMutex != nullptr) {
             internalMutex->unlockMutex();
         }
+    }
 private:
     MutexIF* internalMutex;
 };
+
 #endif /* FRAMEWORK_IPC_MUTEXHELPER_H_ */