better double parsing management

flyscan-api/src/main/java/fr/soleil/flyscan/lib/model/parsing/util/ParsingTool.java

@@ -125,7 +125,11 @@ public class ParsingTool implements ParsingUtil {
 
     public static final double parseDouble(String str) {
         double value;
-        if ((str == null) || NAN.equalsIgnoreCase(str) || str.trim().isEmpty()) {
+        if (str == null) {
+            value = Double.NaN;
+        } else {
+            str = str.trim();
+            if (NAN.equalsIgnoreCase(str) || str.isEmpty()) {
                 value = Double.NaN;
             } else if (INFINITY.equalsIgnoreCase(str) || POSITIVE_INFINITY.equalsIgnoreCase(str)) {
                 value = Double.POSITIVE_INFINITY;
@@ -134,6 +138,7 @@ public class ParsingTool implements ParsingUtil {
             } else {
                 value = Double.parseDouble(str);
             }
+        }
         return value;
     }