Listing all entries in DayOne Classic journal throws IndexError (#786)

* Reproduce bug in #780
🎵 I have no body, no body to love me... 🎵
The bug is cause by a DayOne entry that has to entry body.

* Deal with empty bodies
Close #780.

* [Travis-CI] add "tree" command to debug missing files
* Fix file location
I have no idea why, but it ran locally fine without issue. Travis is more particular...

features/data/configs/bug780.yaml

@@ -0,0 +1,12 @@
+default_hour: 9
+default_minute: 0
+editor: ''
+encrypt: false
+highlight: true
+journals:
+  default: features/journals/bug780.dayone
+linewrap: 80
+tagsymbols: '@'
+template: false
+timeformat: '%Y-%m-%d %H:%M'
+indent_character: "|"

features/data/journals/bug780.dayone/entries/48A25033B34047C591160A4480197D8B.doentry

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>Activity</key>
+	<string>Stationary</string>
+	<key>Creation Date</key>
+	<date>2019-12-30T21:28:54Z</date>
+	<key>Entry Text</key>
+	<string></string>
+	<key>Starred</key>
+	<false />
+	<key>UUID</key>
+	<string>48A25033B34047C591160A4480197D8B</string>
+	<key>Creator</key>
+	<dict>
+		<key>Device Agent</key>
+		<string>PC</string>
+		<key>Generation Date</key>
+		<date>2019-12-30T21:28:54Z</date>
+		<key>Host Name</key>
+		<string>LE-TREPORT</string>
+		<key>OS Agent</key>
+		<string>Microsoft Windows/10 Home</string>
+		<key>Software Agent</key>
+		<string>Journaley/2.1</string>
+	</dict>
+	<key>Tags</key>
+	<array>
+		<string>i_have_no_body</string>
+	</array>
+</dict>
+</plist>