YETUS-949. remove empty filenames in find_changed_files

[aw-was-here]

No description provided.

[apache-yetus]

(!) A patch to the testing environment has been detected.
Re-executing against the patched versions to perform further tests.
The console is at https://builds.apache.org/job/yetus-github-multibranch/job/PR-96/1/console in case of problems.

[apache-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	3m 47s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
		_ master Compile Tests _
		_ Patch Compile Tests _
+1 💚	shellcheck	0m 1s	There were no new shellcheck issues.
+1 💚	shelldocs	0m 0s	There were no new shelldocs issues.
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
		_ Other Tests _
+0 🆗	asflicense	0m 17s	ASF License check generated no output?
		4m 31s

Subsystem	Report/Notes
Docker	Client=19.03.6 Server=19.03.6 base: https://builds.apache.org/job/yetus-github-multibranch/job/PR-96/1/artifact/out/Dockerfile
GITHUB PR	#96
Optional Tests	dupname asflicense shellcheck shelldocs
uname	Linux 1ed3afcf4086 4.15.0-74-generic #84-Ubuntu SMP Thu Dec 19 08:06:28 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	precommit/src/main/shell/personality/yetus.sh
git revision	master / 52ac7ff
Max. process+thread count	8 (vs. ulimit of 2000)
modules	C: precommit U: precommit
Console output	https://builds.apache.org/job/yetus-github-multibranch/job/PR-96/1/console
versions	git=2.7.4 maven=3.3.9 shellcheck=0.7.0
Powered by	Apache Yetus 0.12.0-SNAPSHOT https://yetus.apache.org

This message was automatically generated.

[apache-yetus]

(!) A patch to the testing environment has been detected.
Re-executing against the patched versions to perform further tests.
The console is at https://builds.apache.org/job/yetus-github-multibranch/job/PR-96/2/console in case of problems.

[apache-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	2m 21s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 1s	No case conflicting files found.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
		_ master Compile Tests _
		_ Patch Compile Tests _
+1 💚	shellcheck	0m 2s	There were no new shellcheck issues.
+1 💚	shelldocs	0m 0s	There were no new shelldocs issues.
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
		_ Other Tests _
+1 💚	asflicense	0m 9s	The patch does not generate ASF License warnings.
		2m 45s

Subsystem	Report/Notes
Docker	ClientAPI=1.40 ServerAPI=1.40 base: https://builds.apache.org/job/yetus-github-multibranch/job/PR-96/2/artifact/out/Dockerfile
GITHUB PR	#96
Optional Tests	dupname asflicense shellcheck shelldocs
uname	Linux 82fdddf6d02b 4.15.0-74-generic #84-Ubuntu SMP Thu Dec 19 08:06:28 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	precommit/src/main/shell/personality/yetus.sh
git revision	master / 0dc9e47
Max. process+thread count	46 (vs. ulimit of 2000)
modules	C: precommit U: precommit
Console output	https://builds.apache.org/job/yetus-github-multibranch/job/PR-96/2/console
versions	git=2.7.4 maven=3.3.9 shellcheck=0.7.0
Powered by	Apache Yetus 0.12.0-SNAPSHOT https://yetus.apache.org

This message was automatically generated.