Fix segfault in prt-cache

Co-authored-by: Alexandr Savca <alexandr.savca89@gmail.com>

configure

@@ -2585,7 +2585,7 @@ fi
 # Define the identity of the package.
 
  PACKAGE=prt-get
- VERSION=5.19.4
+ VERSION=5.19.5
 
 
 cat >>confdefs.h <<_ACEOF

configure.in

@@ -1,7 +1,7 @@
 # Process this file with autoconf to produce a configure script.
 AC_INIT
 AC_CONFIG_SRCDIR([src/prtget.cpp])
-AM_INIT_AUTOMAKE(prt-get,5.19.4)
+AM_INIT_AUTOMAKE(prt-get,5.19.5)
 
 
 dnl Determine default prefix

src/pkgdb.cpp

@@ -27,7 +27,7 @@ using namespace std;
 
 
 const string PkgDB::PKGDB = "/var/lib/pkg/db";
-const string PkgDB::ALIAS_STORE = LOCALSTATEDIR"/lib/pkg/prt-get.aliases";
+const string PkgDB::ALIAS_STORE = SYSCONFDIR"/prt-get.aliases";
 
 /*!
   Create a PkgDB object

src/prtget.cpp

@@ -1806,6 +1806,11 @@ void PrtGet::ls()
     if ( p ) {
         string dirname = p->path() + "/" + p->name();
         DIR* dir = opendir(dirname.c_str());
+        if (dir == NULL) {
+                cerr << "Directory " << dirname << " not found" << endl;
+                m_returnValue = PG_GENERAL_ERROR;
+                return;
+        }
         struct dirent* entry;
         vector<string> files;
         while ((entry = readdir(dir))) {
@@ -1848,7 +1853,7 @@ void PrtGet::cat()
         }
         string file = p->path() + "/" + p->name() + "/" + fileName;
         if (!printFile(file)) {
-            cerr << "File '" << *it << "' not found" << endl;
+            cerr << "File '" << fileName << "' not found" << endl;
             m_returnValue = PG_GENERAL_ERROR;
             return;
         }