Use develop if no matching branch found

.travis-test-riot.sh

@@ -12,9 +12,11 @@ REACT_SDK_DIR=`pwd`
 curbranch="${TRAVIS_PULL_REQUEST_BRANCH:-$TRAVIS_BRANCH}"
 echo "Determined branch to be $curbranch"
 
-git clone --depth=1 --branch "$curbranch" https://github.com/vector-im/riot-web.git \
+git clone --depth=1 https://github.com/vector-im/riot-web.git \
     "$RIOT_WEB_DIR"
 
+git checkout "$curbranch" || git checkout develop
+
 cd "$RIOT_WEB_DIR"
 
 mkdir node_modules