fix "Unknown error" when configuring regions

[MarkSh1]

When executing the command "fdbcli --exec 'fileconfigure..." the error message "ERROR: unknown parameter" is displayed.
The error occurred in
ConfigurationResult buildConfiguration(std::vector const& modeTokens, std::map<std::string, std::string>& outConf);
since the vector of modeTokens included reference to an empty string that got into the vector in the function
ConfigurationResult buildConfiguration(std::string const& configMode, std::map<std::string, std::string>& outConf);
since the configMode begins from empty string which added in
std::string DatabaseConfiguration::configureStringFromJSON(const StatusObject& json)

[foundationdb-ci]

Result of foundationdb-pr-clang-arm on Linux CentOS 7

• Commit ID: 97d3077
• Duration 0:04:47
• Result: ❌ FAILED
• Error: Error while executing command: cmake -S . -B build_output -D USE_CCACHE=ON -D USE_WERROR=ON -D RUN_JUNIT_TESTS=ON -D RUN_JAVA_INTEGRATION_TESTS=ON -D BUILD_DOCUMENTATION=ON -D BUILD_AWS_BACKUP=OFF -G Ninja. Reason: exit status 1
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[foundationdb-ci]

Result of foundationdb-pr-clang-ide on Linux CentOS 7

• Commit ID: 97d3077
• Duration 0:19:24
• Result: ✅ SUCCEEDED
• Error: N/A
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[foundationdb-ci]

Result of foundationdb-pr-clang on Linux CentOS 7

• Commit ID: 97d3077
• Duration 0:28:44
• Result: ❌ FAILED
• Error: Error while executing command: ninja -v -C build_output -j ${NPROC} all packages strip_targets. Reason: exit status 1
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[foundationdb-ci]

Result of foundationdb-pr-cluster-tests on Linux CentOS 7

• Commit ID: 97d3077
• Duration 0:32:13
• Result: ❌ FAILED
• Error: Error while executing command: ninja -v -C build_output -j ${NPROC} all packages strip_targets. Reason: exit status 1
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)
• Cluster Test Logs zip file of the test logs (available for 30 days)

[foundationdb-ci]

Result of foundationdb-pr on Linux CentOS 7

• Commit ID: 97d3077
• Duration 0:33:14
• Result: ❌ FAILED
• Error: Error while executing command: ninja -v -C build_output -j ${NPROC} all packages strip_targets. Reason: exit status 1
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[jzhou77]

Can you rebase your PR with main branch? We fixed a few compiling issues.