Adding exception when trying to update without configuring

Author: OscarMrZ

include/filters/filter_chain.hpp

@@ -190,6 +190,9 @@ class FilterChain
    */
   bool update(const T & data_in, T & data_out)
   {
+    if (!configured_) {
+      throw std::runtime_error("The update cannot be called without configuring the filter chain!");
+    }
     bool result;
     size_t list_size = reference_pointers_.size();
     if (list_size == 0) {