armem_laser_scans/client/common/Reader: checking if core segment and provider segment exist

source/RobotAPI/libraries/armem_laser_scans/client/common/Reader.cpp

@@ -200,6 +200,27 @@ namespace armarx::armem::laser_scans::client
                     .errorMessage = qResult.errorMessage};
         }
 
+        if (not qResult.memory.hasCoreSegment(constants::memoryName))
+        {
+            ARMARX_VERBOSE << "No core segment `" << constants::memoryName << "` found in memory!";
+            return {.laserScans = {},
+                    .sensors = {},
+                    .status = Result::Status::Error,
+                    .errorMessage =
+                        "No core segment `" + constants::memoryName + "`found in memory!"};
+        }
+
+        if (not qResult.memory.getCoreSegment(constants::memoryName)
+                    .hasProviderSegment(query.agent))
+        {
+            ARMARX_VERBOSE << "No provider segment `" << query.agent << "` found in memory!";
+            return {.laserScans = {},
+                    .sensors = {},
+                    .status = Result::Status::Error,
+                    .errorMessage = "No provider segment `" + query.agent + "`found in memory!"};
+        }
+
+
         // now create result from memory
         const wm::ProviderSegment& providerSegment =
             qResult.memory.getCoreSegment(constants::memoryName).getProviderSegment(query.agent);