Task graph generation fails when preceded by code generation flow

[tiagolascasas]

Happens with CortexSuite mser and tracking benchmarks. ETG flow fails if it reuses the AST from the transformation flow, but passes if it is parsed from a file. Error log:

Error processing app vision-tracking: TypeError: Cannot read properties of undefined (reading 'name')
    at ClavaUtils.functionHasImplementation (file:///home/tls/clava-workspace/extended-task-graph/dist/src/util/ClavaUtils.js:114:17)
    at TaskGraphBuilder.buildLevel (file:///home/tls/clava-workspace/extended-task-graph/dist/src/taskgraph/TaskGraphBuilder.js:96:28)
    at TaskGraphBuilder.buildLevel (file:///home/tls/clava-workspace/extended-task-graph/dist/src/taskgraph/TaskGraphBuilder.js:97:42)
    at TaskGraphBuilder.buildLevel (file:///home/tls/clava-workspace/extended-task-graph/dist/src/taskgraph/TaskGraphBuilder.js:97:42)
    at TaskGraphBuilder.build (file:///home/tls/clava-workspace/extended-task-graph/dist/src/taskgraph/TaskGraphBuilder.js:19:30)
    at TaskGraphGenerationFlow.buildTaskGraph (file:///home/tls/clava-workspace/extended-task-graph/dist/src/api/TaskGraphGenerationFlow.js:42:35)
    at TaskGraphGenerationFlow.runAll (file:///home/tls/clava-workspace/extended-task-graph/dist/src/api/TaskGraphGenerationFlow.js:15:25)
    at ExtendedTaskGraphAPI.runTaskGraphGenerationFlow (file:///home/tls/clava-workspace/extended-task-graph/dist/src/api/ExtendedTaskGraphAPI.js:33:25)
    at file:///home/tls/clava-workspace/hoopa-experiments/dist/CortexSuite.js:51:20
    at ModuleJob.run (node:internal/modules/esm/module_job:195:25)

[tiagolascasas]

Possibly the same issue as #3