Fixed a bug in epicsadpater where a SCDeleteConnection called from EpicsWriteFunc called Log()

. This the was called from a thread which did not have a connection to the MongoDB. This caused a core dump.

epicsadapter.c

@@ -382,7 +382,9 @@ static void EpicsWriteFunc(void *param)
 
   goto cleanup;
  cleanup:
-  SCDeleteConnection(wp->pCon);
+  if(wp->pCon != NULL){
+    SCDeleteConnection(wp->pCon);
+  }
   ReleaseHdbValue(&wp->v);
   free(wp);
   free(pv);