[PATCH] DischargeCurveGenerator: Prevent NPE when no gauge can be found

[Wald Commits]

# HG changeset patch
# User Felix Wolfsteller <felix.wolfsteller at intevation.de>
# Date 1377760493 -7200
# Node ID 765cf5fe26c369a1d2a02ae9a706280326cff3bf
# Parent  4c0222d9405532efbc07a465afb039bb614cb548
DischargeCurveGenerator: Prevent NPE when no gauge can be found.
No gauge happens e.g. at Rhein Vollmer-curve-calculations with
default values.

diff -r 4c0222d94055 -r 765cf5fe26c3 artifacts/src/main/java/org/dive4elements/river/exports/DischargeCurveGenerator.java
--- a/artifacts/src/main/java/org/dive4elements/river/exports/DischargeCurveGenerator.java	Wed Aug 28 12:02:56 2013 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/exports/DischargeCurveGenerator.java	Thu Aug 29 09:14:53 2013 +0200
@@ -82,6 +82,10 @@
         // Get gauge which is defined for km
         Gauge gauge =
             RiverUtils.getRiver(artifact).determineGauge(km-0.1d, km+0.1d);
+        if (gauge == null) {
+            logger.error("No Gauge could be found at station " + km + "!");
+            return 0d;
+        }
         double subtractPNP = 0d;
         // Compare to km.
         if (Math.abs(km - gauge.getStation().doubleValue()) < tolerance) {