Move previous tests for inputs into the format of template 2.13.1

[rannick]

// Check mandatory parameters

// //TODO: move this to utils_nf_core_rnafusion_pipeline
// if (file(params.input).exists() || params.build_references) { ch_input = file(params.input) } else { exit 1, 'Input samplesheet does not exist or was not specified!' }
// if (params.fusioninspector_only && !params.fusioninspector_fusions) { exit 1, 'Parameter --fusioninspector_fusions PATH_TO_FUSION_LIST expected with parameter --fusioninspector_only'}
// if (params.tools_cutoff < 1) { exit 1, 'Parameter: --tools_cutoff should be >= 1'}

Description of feature

// def checkPathParamList = [
// params.fasta,
// params.fai,
// params.gtf,
// params.transcript,
// ]

// for (param in checkPathParamList) if ((param) && !params.build_references) file(param, checkIfExists: true)
// def params_fasta_path_uri = params.fasta =~ /^([a-zA-Z0-9])://(?:[-a-zA-Z0-9()@:%_+.~#?&/=])$/
// // check if params.fasta is a remote uri such as s3://, gs:// or dx://
// if (params_fasta_path_uri){
// log.info "INFO: a remote uri path detected, check for absolute path and trailing '/' not performed"
// // log.info "INFO: remote uri path detected (e.g. s3), check for absolute path and trailing '/' not performed"
// }
// else {
// for (param in checkPathParamList) if ((param.toString())!= file(param).toString() && !params.build_references) { exit 1, "Problem with ${param}: ABSOLUTE PATHS are required! Check for trailing '/' at the end of paths too." }
// }