Ignore empty strings breaks with numeric JSON values

[MadsHolten]

This line breaks parsing with JSON that contains numeric values:

rmlmapper-js/src/input-parser/SourceParser.ts

Line 54 in 42212c7

values = values.filter((value: string): boolean => value.trim() !== '');

The following error is thrown:

TypeError: value.trim is not a function

at /app/node_modules/@comake/rmlmapper-js/dist/input-parser/SourceParser.js:27:53

at Array.filter ()

at JsonParser.getData (/app/node_modules/@comake/rmlmapper-js/dist/input-parser/SourceParser.js:27:29)

at FunctionExecutor.getValueOfReference (/app/node_modules/@comake/rmlmapper-js/dist/FunctionExecutor.js:105:34)

at FunctionExecutor.getParameterValue (/app/node_modules/@comake/rmlmapper-js/dist/FunctionExecutor.js:92:25)

at /app/node_modules/@comake/rmlmapper-js/dist/FunctionExecutor.js:81:38

at Array.map ()

at FunctionExecutor.calculateFunctionParams (/app/node_modules/@comake/rmlmapper-js/dist/FunctionExecutor.js:79:38)

at FunctionExecutor.executeFunctionFromValue (/app/node_modules/@comake/rmlmapper-js/dist/FunctionExecutor.js:17:35)

at process.processTicksAndRejections (node:internal/process/task_queues:105:5)