Fixed travis config problem.

3c161139 · Davis King · 5e117acd · 3c161139
Commit 3c161139 authored Jan 21, 2018 by Davis King
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build-and-test.sh dlib/travis/build-and-test.sh +4 -1

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--- a/dlib/travis/build-and-test.sh
+++ b/dlib/travis/build-and-test.sh
@@ -2,7 +2,10 @@
 # Exit if anything fails.
 set -eux

-eval "${MATRIX_EVAL}"
+# execute the contents of MATRIX_EVAL if it's set
+if [[ -v MATRIX_EVAL ]]; then
+    eval "${MATRIX_EVAL}"
+fi

 # build dlib and tests
 if [ "$VARIANT" = "test" ]; then