Decrements active task counter when reaction call is cancelled due to…

… missing data (#19)

src/include/nuclear_bits/util/CallbackGenerator.hpp

@@ -61,12 +61,12 @@ namespace util {
 
             // Add one to our active tasks
             ++r.active_tasks;
-            
+
             // Check if we should even run
             if (!DSL::precondition(r)) {
                 // Take one from our active tasks
                 --r.active_tasks;
-                
+
                 // We cancel our execution by returning an empty function
                 return std::make_pair(0, threading::ReactionTask::TaskFunction());
             }
@@ -82,6 +82,9 @@ namespace util {
 
                 // Check if our data is good (all the data exists) otherwise terminate the call
                 if (!check_data(data)) {
+                    // Take one from our active tasks
+                    --r.active_tasks;
+
                     // We cancel our execution by returning an empty function
                     return std::make_pair(0, threading::ReactionTask::TaskFunction());
                 }
@@ -118,7 +121,7 @@ namespace util {
 
                         // Run our postconditions
                         DSL::postcondition(*task);
-                        
+
                         // Take one from our active tasks
                         --task->parent.active_tasks;