mra/visualizations/ColorMapVisualization: Fix null pointer exception …

…when no estimated state can be found for the data entry.

src/java/pt/lsts/neptus/mra/visualizations/ColorMapVisualization.java

@@ -421,6 +421,8 @@ private DataDiscretizer parseLog(String entity) {
                     continue;
 
                 stateEntry = stateParser.getEntryAtOrAfter(parser.currentTimeMillis());
+                if (stateEntry == null)
+                    continue;
 
                 LocationType loc = new LocationType();
                 loc.setLatitudeRads(stateEntry.getDouble("lat"));