F file read error

Summary

See #30 (closed). Having an empty path for the certificate leads to a vanilla basic iostream error

Focus

The basic exception is caught and changed into a slightly more precise Exception with error code.

Test Environment

e.g. set cert path to empty string and try to connect

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include/caosdb/utility.h

@@ -90,7 +90,7 @@ inline auto load_string_file(const path &path) -> std::string {
   std::string result;
   // TODO(htw)
   // try {
-    boost::filesystem::load_string_file(path, result);
+  boost::filesystem::load_string_file(path, result);
   // } catch (const std::exception &exc) {
   //   throw caosdb::exceptions::Exception(StatusCode::FILE_CANNOT_BE_READ ,
   //                                         "Cannot read the following file: "+ path.string());