Nested if-then-else in demo/SearchFiles.java [LUCENE-7846]

/demo/src/java/org/apache/lucene/demo/SearchFiles.java

Line 181-191, nested if avoid the print of title if path is null.

Document doc = searcher.doc(hits[i].doc);
String path = doc.get("path");
if (path != null) {
System.out.println((i+1) + ". " + path);
String title = doc.get("title");
if (title != null) {
System.out.println(" Title: " + doc.get("title"));
}
} else {
System.out.println((i+1) + ". " + "No path for this document");
}

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unnested if-then-else to print the title even if path is null.

Document doc = searcher.doc(hits[i].doc);
String path = doc.get("path");
if (path != null) {
System.out.println((i+1) + ". " + path);
}
else {
System.out.println((i+1) + ". " + "No path for this document");
}

String title = doc.get("title");
if (title != null) {
System.out.println(" Title: " + title);
}
else {
System.out.println((i+1) + ". " + "No title for this document");
}

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Migrated from [LUCENE-7846](https://issues.apache.org/jira/browse/LUCENE-7846) by www.jbigdata.fr, updated Jun 17 2017

Start in demo/src/java/org/apache/lucene/demo/SearchFiles.java around lines 181-191 and inspect how path and title are reported for each search hit. Verify the demo output for documents with and without path or title, and consider the issue complete when title reporting is independent of path reporting and missing values produce the requested messages.

Written by the indexing model from the issue text.