From af393d511808da21ba62f115ae71cddf9f89f207 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludger=20K=C3=BCperkoch?= <kueperkoch@bestec-for-nature.com>
Date: Thu, 25 Jan 2018 11:34:37 +0100
Subject: [PATCH] Take into account that dip/azimut might be 0 when not
 available.

---
 pylot/RELEASE-VERSION    | 2 +-
 pylot/core/util/utils.py | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/pylot/RELEASE-VERSION b/pylot/RELEASE-VERSION
index 33a2193d..12afd1d6 100644
--- a/pylot/RELEASE-VERSION
+++ b/pylot/RELEASE-VERSION
@@ -1 +1 @@
-98f7-dirty
+97de-dirty
diff --git a/pylot/core/util/utils.py b/pylot/core/util/utils.py
index 6de1e8e4..239f3c8d 100644
--- a/pylot/core/util/utils.py
+++ b/pylot/core/util/utils.py
@@ -977,7 +977,7 @@ def check4rotated(data, metadata=None, verbosity=1):
                 dip = blockette_.dip
                 azimut = blockette_.azimuth
                 break
-            if dip is None or azimut is None:
+            if (dip is None or azimut is None) or (dip == 0 and azimut == 0):
                 error_msg = 'Dip and azimuth not available for trace_id {}'.format(trace_id)
                 raise ValueError(error_msg)
             return dip, azimut