Merge branch 'stable-5.5'

* stable-5.5:
  Fix NPE in SystemReader in tests

Change-Id: I8500caeca99fe05ce9a80b54330b72e23670a46b
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>

org.eclipse.jgit/src/org/eclipse/jgit/util/SystemReader.java

@@ -428,9 +428,6 @@ public abstract class SystemReader {
 		updateAll(config.getBaseConfig());
 		if (config instanceof FileBasedConfig) {
 			FileBasedConfig cfg = (FileBasedConfig) config;
-			if (!cfg.getFile().exists()) {
-				return;
-			}
 			if (cfg.isOutdated()) {
 				LOG.debug("loading config {}", cfg); //$NON-NLS-1$
 				cfg.load();